NAME

SYNOPSIS

DESCRIPTION

 

 

-? | --help

This option displays a summary of the commands accepted by less (the same as the h command). (Depending on how your shell interprets the question mark, it may be necessary to quote the question mark, thus: ‘-\?’.)

 

 

-A | --SEARCH-SKIP-SCREEN

Causes all forward searches (not just non-repeated searches) to start just after the target line, and all backward searches to start just before the target line. Thus, forward searches will skip part of the displayed screen (from the first line up to and including the target line). Similarly backwards searches will skip the displayed screen from the last line up to and including the target line. This was the default behavior in less versions prior to 441.

 

 

-a | --search-skip-screen

By default, forward searches start at the top of the displayed screen and backwards searches start at the bottom of the displayed screen (except for repeated searches invoked by the n or N commands, which start after or before the “target” line respectively; see the -j option for more about the target line). The -a option causes forward searches to instead start at the bottom of the screen and backward searches to start at the top of the screen, thus skipping all lines displayed on the screen.

 

 

-B | --auto-buffers

By default, when data is read from a pipe, buffers are allocated automatically as needed. If a large amount of data is read from the pipe, this can cause a large amount of memory to be allocated. The -B option disables this automatic allocation of buffers for pipes, so that only 64K (or the amount of space specified by the -b option) is used for the pipe. Warning: use of -B can result in erroneous display, since only the most recently viewed part of the piped data is kept in memory; any earlier data is lost.

 

 

-b n | --buffers=n

Specifies the amount of buffer space less will use for each file, in units of kilobytes (1024 bytes). By default 64K of buffer space is used for each file (unless the file is a pipe; see the -B option). The -b option specifies instead that n kilobytes of buffer space should be used for each file. If n is -1, buffer space is unlimited; that is, the entire file can be read into memory.

 

 

-C | --CLEAR-SCREEN

Same as -c, for compatibility with older versions of less.

 

 

-c | --clear-screen

Causes full screen repaints to be painted from the bottom of the screen. By default, full screen repaints are done from the top line down to avoid the position of the display being moved when using interactive commands.

 

 

-d | --dumb

The -d option suppresses the error message normally displayed if the terminal is dumb; that is, if the terminal lacks some important capability, such as the ability to clear the screen or scroll backward. The -d option does not otherwise change the behavior of less on a dumb terminal.

 

 

-E | --QUIT-AT-EOF

Causes less to automatically exit the first time it reaches end-of-file.

 

 

-e | --quit-at-eof

Causes less to automatically exit the second time it reaches end-of-file. By default, the only way to exit less is via the q command.

 

 

-F | --quit-if-one-screen

Causes less to automatically exit if the entire file can be displayed on the first screen.

 

 

-f | --force

Forces non-regular files to be opened. (A non-regular file is a directory or a device special file.) Also suppresses the warning message when a binary file is opened. By default, less will refuse to open non-regular files.

 

 

-G | --HILITE-SEARCH

The -G option suppresses all highlighting of strings found by search commands.

 

 

-g | --hilite-search

Normally, less will highlight all strings which match the last search command. The -g option changes this behavior to highlight only the particular string which was found by the last search command. This can cause less to run somewhat faster than the default.

 

 

-h n | --max-back-scroll=n

Specifies a maximum number of lines to scroll backward. If it is necessary to scroll backward more than n lines, the screen is repainted in a forward direction instead. (If the terminal does not have the ability to scroll backward, ‘-h0’ is implied.)

 

 

-I | --IGNORE-CASE

Like -i, but searches ignore case even if the pattern contains uppercase letters.

 

 

-i | --ignore-case

Causes searches to ignore case; that is, uppercase and lowercase are considered identical. This option is ignored if any uppercase letters appear in the search pattern; in other words, if a pattern contains uppercase letters, then that search does not ignore case.

 

 

-J | --status-column

Displays a status column at the left edge of the screen. The status column shows the lines that matched the current search. The status column is also used if the -w or -W option is in effect.

 

 

-j n | --jump-target=n

Specifies a line on the screen where the “target” line is to be positioned. The target line is the line specified by any command to search for a pattern, jump to a line number, jump to a file percentage or jump to a tag. The screen line may be specified by a number: the top line on the screen is 1, the next is 2, and so on. The number may be negative to specify a line relative to the bottom of the screen: the bottom line on the screen is -1, the second to the bottom is -2, and so on. Alternately, the screen line may be specified as a fraction of the height of the screen, starting with a decimal point: .5 is in the middle of the screen, .3 is three tenths down from the first line, and so on. If the line is specified as a fraction, the actual line number is recalculated if the terminal window is resized, so that the target line remains at the specified fraction of the screen height. If any form of the -j option is used, forward searches begin at the line immediately after the target line, and backward searches begin at the target line, unless changed by -a or -A. For example, if ‘-j4’ is used, the target line is the fourth line on the screen, so forward searches begin at the fifth line on the screen.

 

 

-K | --quit-on-intr

Causes less to exit immediately (with status 2) when an interrupt character (usually ^C) is typed. Normally, an interrupt character causes less to stop whatever it is doing and return to its command prompt. Note that use of this option makes it impossible to return to the command prompt from the F command.

 

 

-k keyfile | --lesskey-file=keyfile

Causes less to open and interpret the named file as a lesskey(1) file. Multiple -k options may be specified. If the LESSKEY or LESSKEY_SYSTEM environment variable is set, or if a lesskey file is found in a standard place (see KEY BINDINGS), it is also used as a lesskey file.

 

 

-L | --no-lessopen

Ignore the LESSOPEN environment variable (see the INPUT PREPROCESSOR section below). This option can be set from within less, but it will apply only to files opened subsequently, not to the file which is currently open.

 

 

-M | --LONG-PROMPT

Causes less to prompt even more verbosely than more(1).

 

 

-m | --long-prompt

Causes less to prompt verbosely, like more(1), with the percent into the file. By default, less prompts with a colon.

 

 

-N | --LINE-NUMBERS

Causes a line number to be displayed at the beginning of each line in the display.

 

 

-n | --line-numbers

Suppresses line numbers. The default (to use line numbers) may cause less to run more slowly in some cases, especially with a very large input file. Suppressing line numbers with the -n option will avoid this problem. Using line numbers means: the line number will be displayed in the verbose prompt and in the = command, and the v command will pass the current line number to the editor (see also the discussion of LESSEDIT in PROMPTS below).

 

 

-O logfile | --LOG-FILE=logfile

The -O option is like -o, but it will overwrite an existing file without asking for confirmation.

If no log file has been specified, the -o and -O options can be used from within less to specify a log file. Without a file name, they will simply report the name of the log file. The s command is equivalent to specifying -o from within less.

 

 

-o logfile | --log-file=logfile

Causes less to copy its input to the named file as it is being viewed. This applies only when the input file is a pipe, not an ordinary file. If the file already exists, less will ask for confirmation before overwriting it.

 

 

-P prompt | --prompt=prompt

Provides a way to tailor the three prompt styles to your own preference. This option would normally be put in the LESS environment variable, rather than being typed in with each less command. Such an option must either be the last option in the LESS variable, or be terminated by a dollar sign.

• -Ps string changes the default (short) prompt to string.
• -Pm changes the medium (-m) prompt.
• -PM changes the long (-M) prompt.
• -Ph changes the prompt for the help screen.
• -P= changes the message printed by the = command.
• -Pw changes the message printed while waiting for data (in the F command).

All prompt strings consist of a sequence of letters and special escape sequences. See the section on PROMPTS for more details.

 

 

-p pattern | --pattern=pattern

The -p option on the command line is equivalent to specifying +/pattern; that is, it tells less to start at the first occurrence of pattern in the file.

 

 

-Q | --QUIET | --SILENT

Causes totally quiet operation: the terminal bell is never rung.

 

 

-q | --quiet | --silent

Causes moderately quiet operation: the terminal bell is not rung if an attempt is made to scroll past the end of the file or before the beginning of the file. If the terminal has a visual bell, it is used instead. The bell will be rung on certain other errors, such as typing an invalid character. The default is to ring the terminal bell in all such cases.

 

 

-R | --RAW-CONTROL-CHARS

Like -r, but only ANSI color escape sequences are output in raw form. Unlike -r, the screen appearance is maintained correctly in most cases. ANSI color escape sequences are sequences of the form:

ESC [ ... m

where the “...” is zero or more color specification characters. For the purpose of keeping track of screen appearance, ANSI color escape sequences are assumed to not move the cursor. You can make less think that characters other than ‘m’ can end ANSI color escape sequences by setting the environment variable LESSANSIENDCHARS to the list of characters which can end a color escape sequence. And you can make less think that characters other than the standard ones may appear between the ESC and the m by setting the environment variable LESSANSIMIDCHARS to the list of characters which can appear.

 

 

-r | --raw-control-chars

Causes raw control characters to be displayed. The default is to display control characters using the caret notation; for example, a control-A (octal 001) is displayed as ‘^A’. Warning: when the -r option is used, less cannot keep track of the actual appearance of the screen (since this depends on how the screen responds to each type of control character). Thus, various display problems may result, such as long lines being split in the wrong place.

 

 

-S | --chop-long-lines

Causes lines longer than the screen width to be chopped (truncated) rather than wrapped. That is, the portion of a long line that does not fit in the screen width is not shown. The default is to wrap long lines; that is, display the remainder on the next line.

 

 

-s | --squeeze-blank-lines

Causes consecutive blank lines to be squeezed into a single blank line.

 

 

-T tagsfile | --tag-file=tagsfile

Specifies a tags file to be used instead of tags.

 

 

-t tag | --tag=tag

The -t option, followed immediately by a tag, will edit the file containing that tag. For this to work, tag information must be available; for example, there may be a file in the current directory called tags, which was previously built by ctags(1) or an equivalent command. The -t option may also be specified from within less (using the - command) as a way of examining a new file. The command :t is equivalent to specifying -t from within less.

 

 

-U | --UNDERLINE-SPECIAL

Causes backspaces, tabs and carriage returns to be treated as control characters; that is, they are handled as specified by the -r option.

By default, if neither -u nor -U is given, backspaces which appear adjacent to an underscore character are treated specially: the underlined text is displayed using the terminal's hardware underlining capability. Also, backspaces which appear between two identical characters are treated specially: the overstruck text is printed using the terminal's hardware boldface capability. Other backspaces are deleted, along with the preceding character. Carriage returns immediately followed by a newline are deleted. Other carriage returns are handled as specified by the -r option. Text which is overstruck or underlined can be searched for if neither -u nor -U is in effect.

 

 

-u | --underline-special

Causes backspaces and carriage returns to be treated as printable characters; that is, they are sent to the terminal when they appear in the input.

 

 

-V | --version

Displays the version number of less.

 

 

-W | --HILITE-UNREAD

Like -w, but temporarily highlights the first new line after any forward movement command larger than one line.

 

 

-w | --hilite-unread

Temporarily highlights the first new line after a forward movement of a full page. The first new line is the line immediately following the line previously at the bottom of the screen. Also highlights the target line after a g or p command. The highlight is removed at the next command which causes movement. The entire line is highlighted, unless the -J option is in effect, in which case only the status column is highlighted.

 

 

-X | --no-init

Disables sending the termcap initialization and deinitialization strings to the terminal. This is sometimes desirable if the deinitialization string does something unnecessary, like clearing the screen.

 

 

-x n,... | --tabs=n,...

Sets tab stops. If only one n is specified, tab stops are set at multiples of n. If multiple values separated by commas are specified, tab stops are set at those positions, and then continue with the same spacing as the last two. For example, ‘-x9,17’ will set tabs at positions 9, 17, 25, 33, etc. The default for n is 8.

 

 

-y n | --max-forw-scroll=n

Specifies a maximum number of lines to scroll forward. If it is necessary to scroll forward more than n lines, the screen is repainted instead. The -c or -C option may be used to repaint from the top of the screen if desired. By default, any forward movement causes scrolling.

 

 

-z n | --window=n

Changes the default scrolling window size to n lines. The default is one screenful. The z and w commands can also be used to change the window size. The z may be omitted for compatibility with some versions of more(1). If the number n is negative, it indicates n lines less than the current screen size. For example, if the screen is 24 lines, -z-4 sets the scrolling window to 20 lines. If the screen is resized to 40 lines, the scrolling window automatically changes to 36 lines.

 

 

--follow-name

Normally, if the input file is renamed while an F command is executing, less will continue to display the contents of the original file despite its name change. If --follow-name is specified, during an F command less will periodically attempt to reopen the file by name. If the reopen succeeds and the file is a different file from the original (which means that a new file has been created with the same name as the original (now renamed) file), less will display the contents of that new file.

 

 

--no-keypad

Disables sending the keypad initialization and deinitialization strings to the terminal. This is sometimes useful if the keypad strings make the numeric keypad behave in an undesirable manner.

 

 

--use-backslash

This option changes the interpretations of options which follow this one. After the --use-backslash option, any backslash in an option string is removed and the following character is taken literally. This allows a dollar sign to be included in option strings.

 

 

-" cc | --quotes=cc

Changes the filename quoting character. This may be necessary if you are trying to name a file which contains both spaces and quote characters. If cc is a single character, this changes the quote character to that character. Filenames containing a space should then be surrounded by that character rather than by double quotes. If cc consists of two characters, this changes the open quote to the first character, and the close quote to the second character. Filenames containing a space should then be preceded by the open quote character and followed by the close quote character. Note that even after the quote characters are changed, this option remains -" (a dash followed by a double quote).

 

 

-~ | --tilde

Normally lines after end of file are displayed as a single tilde (~). This option causes lines after end of file to be displayed as blank lines.

 

 

-# | --shift

Specifies the default number of positions to scroll horizontally in the RIGHTARROW and LEFTARROW commands. If the number specified is zero, it sets the default number of positions to one half of the screen width. Alternately, the number may be specified as a fraction of the width of the screen, starting with a decimal point: .5 is half of the screen width, .3 is three tenths of the screen width, and so on. If the number is specified as a fraction, the actual number of scroll positions is recalculated if the terminal window is resized, so that the actual scroll remains at the specified fraction of the screen width.

 

 

--

A command line argument of -- marks the end of option arguments. Any arguments following this are interpreted as filenames. This can be useful when viewing a file whose name begins with a ‘-’ or ‘+’.

 

 

+

If a command line option begins with +, the remainder of that option is taken to be an initial command to less. For example, +G tells less to start at the end of the file rather than the beginning, and +/xyz tells it to start at the first occurrence of “xyz” in the file. As a special case, +number acts like +numberg; that is, it starts the display at the specified line number (however, see the caveat under the g command below). If the option starts with ++, the initial command applies to every file being viewed, not just the first one. The + command described previously may also be used to set (or change) an initial command for every file.

COMMANDS

 

 

h | H

Help: display a summary of these commands. If you forget all the other commands, remember this one.

 

 

SPACE | ^V | f | ^F

Scroll forward N lines, default one window (see option -z above). If N is more than the screen size, only the final screenful is displayed. Warning: some systems use ^V as a special literalization character.

 

 

z

Like SPACE, but if N is specified, it becomes the new window size.

 

 

ESC-SPACE

Like SPACE, but scrolls a full screenful, even if it reaches end-of-file in the process.

 

 

ENTER | RETURN | ^N | e | ^E | j | ^J

Scroll forward N lines, default 1. The entire N lines are displayed, even if N is more than the screen size.

 

 

d | ^D

Scroll forward N lines, default one half of the screen size. If N is specified, it becomes the new default for subsequent d and u commands.

 

 

b | ^B | ESC-v

Scroll backward N lines, default one window (see option -z above). If N is more than the screen size, only the final screenful is displayed.

 

 

w

Like ESC-v, but if N is specified, it becomes the new window size.

 

 

y | ^Y | ^P | k | ^K

Scroll backward N lines, default 1. The entire N lines are displayed, even if N is more than the screen size. Warning: some systems use ^Y as a special job control character.

 

 

u | ^U

Scroll backward N lines, default one half of the screen size. If N is specified, it becomes the new default for subsequent d and u commands.

 

 

ESC-) | RIGHTARROW

Scroll horizontally right N characters, default half the screen width (see the -# option). If a number N is specified, it becomes the default for future RIGHTARROW and LEFTARROW commands. While the text is scrolled, it acts as though the -S option (chop lines) were in effect.

 

 

ESC-( | LEFTARROW

Scroll horizontally left N characters, default half the screen width (see the -# option). If a number N is specified, it becomes the default for future RIGHTARROW and LEFTARROW commands.

 

 

r | ^R | ^L

Repaint the screen.

 

 

R

Repaint the screen, discarding any buffered input. Useful if the file is changing while it is being viewed.

 

 

F

Scroll forward, and keep trying to read when the end of file is reached. Normally this command would be used when already at the end of the file. It is a way to monitor the tail of a file which is growing while it is being viewed. (The behavior is similar to the "tail -f" command.)

 

 

ESC-F

Like F, but as soon as a line is found which matches the last search pattern, the terminal bell is rung and forward scrolling stops.

 

 

g | < | ESC-<

Go to line N in the file, default 1 (beginning of file). (Warning: this may be slow if N is large.)

 

 

G | > | ESC->

Go to line N in the file, default the end of the file. (Warning: this may be slow if N is large, or if N is not specified and standard input, rather than a file, is being read.)

 

 

p | %

Go to a position N percent into the file. N should be between 0 and 100, and may contain a decimal point.

 

 

P

Go to the line containing byte offset N in the file.

 

 

{

If a left curly bracket appears in the top line displayed on the screen, the { command will go to the matching right curly bracket. The matching right curly bracket is positioned on the bottom line of the screen. If there is more than one left curly bracket on the top line, a number N may be used to specify the N-th bracket on the line.

 

 

}

If a right curly bracket appears in the bottom line displayed on the screen, the } command will go to the matching left curly bracket. The matching left curly bracket is positioned on the top line of the screen. If there is more than one right curly bracket on the top line, a number N may be used to specify the N-th bracket on the line.

 

 

(

Like {, but applies to parentheses rather than curly brackets.

 

 

)

Like }, but applies to parentheses rather than curly brackets.

 

 

[

Like {, but applies to square brackets rather than curly brackets.

 

 

]

Like }, but applies to square brackets rather than curly brackets.

 

 

ESC-^F

Followed by two characters, acts like {, but uses the two characters as open and close brackets, respectively. For example, "ESC ^F < >" could be used to go forward to the > which matches the < in the top displayed line.

 

 

ESC-^B

Followed by two characters, acts like }, but uses the two characters as open and close brackets, respectively. For example, "ESC ^B < >" could be used to go backward to the < which matches the > in the bottom displayed line.

 

 

m

Followed by any lowercase letter, marks the current position with that letter.

 

 

'

(Single quote.) Followed by any lowercase letter, returns to the position which was previously marked with that letter. Followed by another single quote, returns to the position at which the last "large" movement command was executed. Followed by a ^ or $, jumps to the beginning or end of the file respectively. Marks are preserved when a new file is examined, so the ' command can be used to switch between input files.

 

 

^X^X

Same as single quote.

 

 

/pattern

Search forward in the file for the N-th line containing the pattern. N defaults to 1. The pattern is a regular expression, as recognized by the regular expression library supplied by your system. The search starts at the first line displayed (but see the -a and -j options, which change this).

Certain characters are special if entered at the beginning of the pattern; they modify the type of search rather than become part of the pattern:

 

 

^N | !

Search for lines which do NOT match the pattern.

 

 

^E | *

Search multiple files. That is, if the search reaches the END of the current file without finding a match, the search continues in the next file in the command line list.

 

 

^F | @

Begin the search at the first line of the FIRST file in the command line list, regardless of what is currently displayed on the screen or the settings of the -a or -j options.

 

 

^K

Highlight any text which matches the pattern on the current screen, but don't move to the first match (KEEP current position).

 

 

^R

Don't interpret regular expression metacharacters; that is, do a simple textual comparison.

 

 

?pattern

Search backward in the file for the N-th line containing the pattern. The search starts at the line immediately before the top line displayed.

Certain characters are special, as in the / command:

 

 

^N | !

Search for lines which do NOT match the pattern.

 

 

^E | *

Search multiple files. That is, if the search reaches the beginning of the current file without finding a match, the search continues in the previous file in the command line list.

 

 

^F | @

Begin the search at the last line of the last file in the command line list, regardless of what is currently displayed on the screen or the settings of the -a or -j options.

 

 

^K

As in forward searches.

 

 

^R

As in forward searches.

 

 

ESC-/pattern

Same as "/*".

 

 

ESC-?pattern

Same as "?*".

 

 

n

Repeat previous search, for N-th line containing the last pattern. If the previous search was modified by ^N, the search is made for the N-th line NOT containing the pattern. If the previous search was modified by ^E, the search continues in the next (or previous) file if not satisfied in the current file. If the previous search was modified by ^R, the search is done without using regular expressions. There is no effect if the previous search was modified by ^F or ^K.

 

 

N

Repeat previous search, but in the reverse direction.

 

 

ESC-n

Repeat previous search, but crossing file boundaries. The effect is as if the previous search were modified by *.

 

 

ESC-N

Repeat previous search, but in the reverse direction and crossing file boundaries.

 

 

ESC-u

Undo search highlighting. Turn off highlighting of strings matching the current search pattern. If highlighting is already off because of a previous ESC-u command, turn highlighting back on. Any search command will also turn highlighting back on. (Highlighting can also be disabled by toggling the -G option; in that case search commands do not turn highlighting back on.)

 

 

&pattern

Display only lines which match the pattern; lines which do not match the pattern are not displayed. If pattern is empty (if you type & immediately followed by ENTER), any filtering is turned off, and all lines are displayed. While filtering is in effect, an ampersand is displayed at the beginning of the prompt, as a reminder that some lines in the file may be hidden.

Certain characters are special as in the / command:

 

 

^N |!

Display only lines which do NOT match the pattern.

 

 

^R

Don't interpret regular expression metacharacters; that is, do a simple textual comparison.

 

 

:e [filename]

Examine a new file. If the filename is missing, the "current" file (see the :n and :p commands below) from the list of files in the command line is re-examined. A percent sign (%) in the filename is replaced by the name of the current file. A pound sign (#) is replaced by the name of the previously examined file. However, two consecutive percent signs are simply replaced with a single percent sign. This allows you to enter a filename that contains a percent sign in the name. Similarly, two consecutive pound signs are replaced with a single pound sign. The filename is inserted into the command line list of files so that it can be seen by subsequent :n and :p commands. If the filename consists of several files, they are all inserted into the list of files and the first one is examined. If the filename contains one or more spaces, the entire filename should be enclosed in double quotes (also see the -" option).

 

 

^X^V | E

Same as :e. Warning: some systems use ^V as a special literalization character. On such systems, you may not be able to use ^V.

 

 

:n

Examine the next file (from the list of files given in the command line). If a number N is specified, the N-th next file is examined.

 

 

:p

Examine the previous file in the command line list. If a number N is specified, the N-th previous file is examined.

 

 

:t

Go to the specified tag.

 

 

:x

Examine the first file in the command line list. If a number N is specified, the N-th file in the list is examined.

 

 

:d

Remove the current file from the list of files.

 

 

t

Go to the next tag, if there were more than one matches for the current tag. See the -t option for more details about tags.

 

 

T

Go to the previous tag, if there were more than one matches for the current tag.

 

 

= | ^G | :f

Prints some information about the file being viewed, including its name and the line number and byte offset of the bottom line being displayed. If possible, it also prints the length of the file, the number of lines in the file and the percent of the file above the last displayed line.

 

 

-

Followed by one of the command line option letters (see DESCRIPTION above), this will change the setting of that option and print a message describing the new setting. If a ^P (CONTROL-P) is entered immediately after the dash, the setting of the option is changed but no message is printed. If the option letter has a numeric value (such as -b or -h), or a string value (such as -P or -t), a new value may be entered after the option letter. If no new value is entered, a message describing the current setting is printed and nothing is changed.

 

 

--

Like the - command, but takes a long option name (see DESCRIPTION above) rather than a single option letter. You must press ENTER or RETURN after typing the option name. A ^P immediately after the second dash suppresses printing of a message describing the new setting, as in the - command.

 

 

-+

Followed by one of the command line option letters this will reset the option to its default setting and print a message describing the new setting. (The "-+X" command does the same thing as ‘-+X’ on the command line.) This does not work for string-valued options.

 

 

--+

Like the -+ command, but takes a long option name rather than a single option letter.

 

 

-!

Followed by one of the command line option letters, this will reset the option to the "opposite" of its default setting and print a message describing the new setting. This does not work for numeric or string-valued options.

 

 

--!

Like the -! command, but takes a long option name rather than a single option letter.

 

 

_

(Underscore.) Followed by one of the command line option letters, this will print a message describing the current setting of that option. The setting of the option is not changed.

 

 

__

(Double underscore.) Like the _ (underscore) command, but takes a long option name rather than a single option letter. You must press ENTER or RETURN after typing the option name.

 

 

+cmd

Causes the specified cmd to be executed each time a new file is examined. For example, +G causes less to initially display each file starting at the end rather than the beginning.

 

 

V

Prints the version number of less being run.

 

 

q | Q | :q | :Q | ZZ

Exits less.

 

 

v

Invokes an editor to edit the current file being viewed. The editor is taken from the environment variable VISUAL, if defined, or EDITOR if VISUAL is not defined, or defaults to "vi" if neither VISUAL nor EDITOR is defined. See also the discussion of LESSEDIT under the section on PROMPTS below.

 

 

| <m> shell-command

<m> represents any mark letter. Pipes a section of the input file to the given shell command. The section of the file to be piped is between the first line on the current screen and the position marked by the letter. <m> may also be ^ or $ to indicate beginning or end of file respectively. If <m> is . or newline, the current screen is piped.

 

 

s filename

Save the input to a file. This only works if the input is a pipe, not an ordinary file.

LINE EDITING

 

 

LEFTARROW [ESC-h]

Move the cursor one space to the left.

 

 

RIGHTARROW [ESC-l]

Move the cursor one space to the right.

 

 

^LEFTARROW [ESC-b or ESC-LEFTARROW]

(That is, CONTROL and LEFTARROW simultaneously.) Move the cursor one word to the left.

 

 

^RIGHTARROW [ESC-w or ESC-RIGHTARROW]

(That is, CONTROL and RIGHTARROW simultaneously.) Move the cursor one word to the right.

 

 

HOME [ESC-0]

Move the cursor to the beginning of the line.

 

 

END [ESC-$]

Move the cursor to the end of the line.

 

 

BACKSPACE

Delete the character to the left of the cursor, or cancel the command if the command line is empty.

 

 

DELETE or [ESC-x]

Delete the character under the cursor.

 

 

^BACKSPACE [ESC-BACKSPACE]

(That is, CONTROL and BACKSPACE simultaneously.) Delete the word to the left of the cursor.

 

 

^DELETE [ESC-X or ESC-DELETE]

(That is, CONTROL and DELETE simultaneously.) Delete the word under the cursor.

 

 

UPARROW [ESC-k]

Retrieve the previous command line. If you first enter some text and then press UPARROW, it will retrieve the previous command which begins with that text.

 

 

DOWNARROW [ESC-j]

Retrieve the next command line. If you first enter some text and then press DOWNARROW, it will retrieve the next command which begins with that text.

 

 

TAB

Complete the partial filename to the left of the cursor. If it matches more than one filename, the first match is entered into the command line. Repeated TABs will cycle through the other matching filenames. If the completed filename is a directory, a "/" is appended to the filename. The environment variable LESSSEPARATOR can be used to specify a different character to append to a directory name.

 

 

BACKTAB [ESC-TAB]

Like TAB, but cycles in the reverse direction through the matching filenames.

 

 

^L

Complete the partial filename to the left of the cursor. If it matches more than one filename, all matches are entered into the command line (if they fit).

 

 

^U

Delete the entire command line, or cancel the command if the command line is empty. If you have changed your line-kill character to something other than ^U, that character is used instead of ^U.

 

 

^G

Delete the entire command line and return to the main prompt.

KEY BINDINGS

INPUT PREPROCESSOR

#! /bin/sh 
case "$1" in 
*.Z)	uncompress -c $1  >/tmp/less.$$  2>/dev/null 
	if [ -s /tmp/less.$$ ]; then 
		echo /tmp/less.$$ 
	else 
		rm -f /tmp/less.$$ 
	fi 
	;; 
esac

#! /bin/sh 
rm $2

#! /bin/sh 
case "$1" in 
*.Z)	uncompress -c $1  2>/dev/null 
*)	exit 1 
	;; 
esac 
exit $?

NATIONAL CHARACTER SETS

 

 

normal characters

Can be displayed directly to the screen.

 

 

control characters

Should not be displayed directly, but are expected to be found in ordinary text files (such as backspace and tab).

 

 

binary characters

Should not be displayed directly and are not expected to be found in text files.

PROMPTS

 

 

%bX

Replaced by the byte offset into the current input file. The b is followed by a single character (shown as X above) which specifies the line whose byte offset is to be used. If the character is a "t", the byte offset of the top line in the display is used, an "m" means use the middle line, a "b" means use the bottom line, a "B" means use the line just after the bottom line, and a "j" means use the "target" line, as specified by the -j option.

 

 

%B

Replaced by the size of the current input file.

 

 

%c

Replaced by the column number of the text appearing in the first column of the screen.

 

 

%dX

Replaced by the page number of a line in the input file. The line to be used is determined by the X, as with the %b option.

 

 

%D

Replaced by the number of pages in the input file, or equivalently, the page number of the last line in the input file.

 

 

%E

Replaced by the name of the editor (from the VISUAL environment variable, or the EDITOR environment variable if VISUAL is not defined). See the discussion of the LESSEDIT feature below.

 

 

%f

Replaced by the name of the current input file.

 

 

%F

Replaced by the last component of the name of the current input file.

 

 

%i

Replaced by the index of the current file in the list of input files.

 

 

%lX

Replaced by the line number of a line in the input file. The line to be used is determined by the X, as with the %b option.

 

 

%L

Replaced by the line number of the last line in the input file.

 

 

%m

Replaced by the total number of input files.

 

 

%pX

Replaced by the percent into the current input file, based on byte offsets. The line used is determined by the X, as with the %b option.

 

 

%PX

Replaced by the percent into the current input file, based on line numbers. The line used is determined by the X, as with the %b option.

 

 

%s

Same as %B.

 

 

%t

Causes any trailing spaces to be removed. Usually used at the end of the string, but may appear anywhere.

 

 

%x

Replaced by the name of the next input file in the list.

 

 

?a

True if any characters have been included in the prompt so far.

 

 

?bX

True if the byte offset of the specified line is known.

 

 

?B

True if the size of the current input file is known.

 

 

?c

True if the text is horizontally shifted (%c is not zero).

 

 

?dX

True if the page number of the specified line is known.

 

 

?e

True if at end-of-file.

 

 

?f

True if there is an input filename (that is, if input is not a pipe).

 

 

?lX

True if the line number of the specified line is known.

 

 

?L

True if the line number of the last line in the file is known.

 

 

?m

True if there is more than one input file.

 

 

?n

True if this is the first prompt in a new input file.

 

 

?pX

True if the percent into the current input file, based on byte offsets, of the specified line is known.

 

 

?PX

True if the percent into the current input file, based on line numbers, of the specified line is known.

 

 

?s

Same as "?B".

 

 

?x

True if there is a next input file (that is, if the current input file is not the last one).

?f%f .?m(file %i of %m) .?e(END) ?x- Next\: %x.: 
	?pB%pB\%:byte %bB?s/%s...%t 
 
?f%f .?n?m(file %i of %m) ..?ltlines %lt-%lb?L/%L. : 
	byte %bB?s/%s. .?e(END) ?x- Next\: %x.:?pB%pB\%..%t

?f%f .?m(file %i of %m) .?ltlines %lt-%lb?L/%L. . 
	byte %bB?s/%s. ?e(END) :?pB%pB\%..%t

SECURITY

 

 

|

The pipe command.

 

 

:e

The examine command.

 

 

v

The editing command.

 

 

s -o

Log files.

 

 

-k

Use of lesskey files.

 

 

-t

Use of tags files.

 

 

Metacharacters in filenames, such as "*".

 

 

Filename completion (TAB, ^L).

COMPATIBILITY WITH MORE

ENVIRONMENT

 

 

COLUMNS

Sets the number of columns on the screen. Takes precedence over the number of columns specified by the TERM variable, but may be overridden by window systems which support TIOCGWINSZ.

 

 

EDITOR

Specifies the default editor if VISUAL is not set. If neither are set, vi(1) is used.

 

 

HOME

Name of the user's home directory (used to find a lesskey file).

 

 

LANG

Language for determining the character set.

 

 

LC_CTYPE

The character encoding locale(1). It decides which byte sequences form characters, what their display width is, and which characters are composing or combining characters.

 

 

LESS

Options which are passed to less automatically. Command line options override the LESS environment variable.

Some options like -k require a string to follow the option letter. The string for that option is considered to end when a dollar sign ($) is found. For example, to separate a prompt value from any other options with dollar sign between them:

LESS="-Ps--More--$-C -e"

If the --use-backslash option appears earlier in the options, then a dollar sign or backslash may be included literally in an option string by preceding it with a backslash. If the --use-backslash option is not in effect, then backslashes are not treated specially, and there is no way to include a dollar sign in the option string.

 

 

LESSANSIENDCHARS

Characters which may end an ANSI color escape sequence (default "m").

 

 

LESSANSIMIDCHARS

Characters which may appear between the ESC character and the end character in an ANSI color escape sequence (default "0123456789;[?!"'#%()*+ ").

 

 

LESSBINFMT

Format for displaying non-printable, non-control characters.

 

 

LESSCLOSE

Command line to invoke the (optional) input-postprocessor.

 

 

LESSEDIT

Editor prototype string (used for the v command). See discussion under PROMPTS.

 

 

LESSHISTFILE

Name of the history file used to remember search commands and shell commands between invocations of less. If set to "-" or "/dev/null", a history file is not used. The default is "-".

 

 

LESSHISTSIZE

The maximum number of commands to save in the history file. The default is 100.

 

 

LESSKEY

Name of the default lesskey(1) file.

 

 

LESSKEY_SYSTEM

Name of the default system-wide lesskey(1) file.

 

 

LESSMETACHARS

List of characters which are considered "metacharacters" by the shell.

 

 

LESSMETAESCAPE

Prefix which less will add before each metacharacter in a command sent to the shell. If LESSMETAESCAPE is an empty string, commands containing metacharacters will not be passed to the shell.

 

 

LESSOPEN

Command line to invoke the (optional) input-preprocessor.

 

 

LESSSECURE

Runs less in "secure" mode. See discussion under SECURITY.

 

 

LESSSEPARATOR

String to be appended to a directory name in filename completion.

 

 

LESSUTFBINFMT

Format for displaying non-printable Unicode code points.

 

 

LESS_IS_MORE

Emulate the more(1) command.

 

 

LINES

Sets the number of lines on the screen. Takes precedence over the number of lines specified by the TERM variable, but may be overridden by window systems which support TIOCGWINSZ.

 

 

MORE

Options which are passed to less automatically when running in more(1) compatible mode.

 

 

SHELL

The shell used to expand filenames.

 

 

TERM

Specifies the terminal type. Used by less to get the terminal characteristics necessary to manipulate the screen.

 

 

VISUAL

Specifies the default editor. If not set, EDITOR is used; if that is not set, vi(1) is used.

SEE ALSO

AUTHORS