less
less
The less command in Unix and Linux is a pager program used to view the contents of text files interactively. It allows you to navigate through files, search for specific content, and perform various operations without loading the entire file into memory, making it efficient for viewing large files.
Basic Usage
The basic syntax for the less command is:
less [options] [file]options: Command-line options to control the behavior ofless.file: The file to be viewed. If no file is specified,lessstarts with standard input.
Examples
Viewing a File
To view a file using less:
less file.txtThis command opens file.txt in the less pager, allowing you to scroll through its contents.
Navigating Within less
Once inside less, you can navigate using:
Arrow keys: Scroll up and down.
Spacebar: Scroll one page down.
Backspace: Scroll one page up.
G: Move to the end of the file.
1G or g: Move to the beginning of the file.
/pattern: Search for
patternforward.?pattern: Search for
patternbackward.n: Move to the next occurrence of the search pattern.
N: Move to the previous occurrence of the search pattern.
q: Quit
less.
Viewing Multiple Files
You can view multiple files in sequence by specifying them as arguments:
less file1.txt file2.txtPress :n to move to the next file and :p to move to the previous file when viewing multiple files.
Viewing Standard Input
You can also pipe output from other commands into less:
ls -l | lessThis command displays the output of ls -l in less, allowing you to scroll through the directory listing.
Options
Some useful options for less include:
-N: Display line numbers.-i: Ignore case in searches.-S: Chop long lines instead of wrapping.-R: Display ANSI color escape sequences in color.
Practical Use Cases
Reading Log Files
When analyzing log files, less allows you to quickly navigate and search for specific entries without loading the entire file into memory.
Browsing Documentation
less is commonly used to view man pages (man command), providing a convenient way to read and search through system documentation.
Reviewing Code or Configuration Files
When reviewing code or configuration files, less enables easy navigation and searching through the content, facilitating efficient code review or troubleshooting.
Summary
The less command is a versatile and efficient pager for viewing and navigating through text files interactively in Unix and Linux environments. Its ability to handle large files gracefully and provide powerful navigation and search capabilities makes it an essential tool for system administrators, developers, and anyone working with textual data.
help
SUMMARY OF LESS COMMANDS
Commands marked with * may be preceded by a number, N.
Notes in parentheses indicate the behavior if N is given.
A key preceded by a caret indicates the Ctrl key; thus ^K is ctrl-K.
h H Display this help.
q :q Q :Q ZZ Exit.
---------------------------------------------------------------------------
MOVING
e ^E j ^N CR * Forward one line (or N lines).
y ^Y k ^K ^P * Backward one line (or N lines).
f ^F ^V SPACE * Forward one window (or N lines).
b ^B ESC-v * Backward one window (or N lines).
z * Forward one window (and set window to N).
w * Backward one window (and set window to N).
ESC-SPACE * Forward one window, but don't stop at end-of-file.
d ^D * Forward one half-window (and set half-window to N).
u ^U * Backward one half-window (and set half-window to N).
ESC-) RightArrow * Right one half screen width (or N positions).
ESC-( LeftArrow * Left one half screen width (or N positions).
ESC-} ^RightArrow Right to last column displayed.
ESC-{ ^LeftArrow Left to first column.
F Forward forever; like "tail -f".
ESC-F Like F but stop when search pattern is found.
r ^R ^L Repaint screen.
R Repaint screen, discarding buffered input.
---------------------------------------------------
Default "window" is the screen height.
Default "half-window" is half of the screen height.
---------------------------------------------------------------------------
SEARCHING
/pattern * Search forward for (N-th) matching line.
?pattern * Search backward for (N-th) matching line.
n * Repeat previous search (for N-th occurrence).
N * Repeat previous search in reverse direction.
ESC-n * Repeat previous search, spanning files.
ESC-N * Repeat previous search, reverse dir. & spanning files.
ESC-u Undo (toggle) search highlighting.
ESC-U Clear search highlighting.
&pattern * Display only matching lines.
---------------------------------------------------
A search pattern may begin with one or more of:
^N or ! Search for NON-matching lines.
^E or * Search multiple files (pass thru END OF FILE).
^F or @ Start search at FIRST file (for /) or last file (for ?).
^K Highlight matches, but don't move (KEEP position).
^R Don't use REGULAR EXPRESSIONS.
^W WRAP search if no match found.
---------------------------------------------------------------------------
JUMPING
g < ESC-< * Go to first line in file (or line N).
G > ESC-> * Go to last line in file (or line N).
p % * Go to beginning of file (or N percent into file).
t * Go to the (N-th) next tag.
T * Go to the (N-th) previous tag.
{ ( [ * Find close bracket } ) ].
} ) ] * Find open bracket { ( [.
ESC-^F <c1> <c2> * Find close bracket <c2>.
ESC-^B <c1> <c2> * Find open bracket <c1>.
---------------------------------------------------
Each "find close bracket" command goes forward to the close bracket
matching the (N-th) open bracket in the top line.
Each "find open bracket" command goes backward to the open bracket
matching the (N-th) close bracket in the bottom line.
m<letter> Mark the current top line with <letter>.
M<letter> Mark the current bottom line with <letter>.
'<letter> Go to a previously marked position.
'' Go to the previous position.
^X^X Same as '.
ESC-M<letter> Clear a mark.
---------------------------------------------------
A mark is any upper-case or lower-case letter.
Certain marks are predefined:
^ means beginning of the file
$ means end of the file
---------------------------------------------------------------------------
CHANGING FILES
:e [file] Examine a new file.
^X^V Same as :e.
:n * Examine the (N-th) next file from the command line.
:p * Examine the (N-th) previous file from the command line.
:x * Examine the first (or N-th) file from the command line.
:d Delete the current file from the command line list.
= ^G :f Print current file name.
---------------------------------------------------------------------------
MISCELLANEOUS COMMANDS
-<flag> Toggle a command line option [see OPTIONS below].
--<name> Toggle a command line option, by name.
_<flag> Display the setting of a command line option.
__<name> Display the setting of an option, by name.
+cmd Execute the less cmd each time a new file is examined.
!command Execute the shell command with $SHELL.
|Xcommand Pipe file between current pos & mark X to shell command.
s file Save input to a file.
v Edit the current file with $VISUAL or $EDITOR.
V Print version number of "less".
---------------------------------------------------------------------------
OPTIONS
Most options may be changed either on the command line,
or from within less by using the - or -- command.
Options may be given in one of two forms: either a single
character preceded by a -, or a name preceded by --.
-? ........ --help
Display help (from command line).
-a ........ --search-skip-screen
Search skips current screen.
-A ........ --SEARCH-SKIP-SCREEN
Search starts just after target line.
-b [N] .... --buffers=[N]
Number of buffers.
-B ........ --auto-buffers
Don't automatically allocate buffers for pipes.
-c ........ --clear-screen
Repaint by clearing rather than scrolling.
-d ........ --dumb
Dumb terminal.
-D xcolor . --color=xcolor
Set screen colors.
-e -E .... --quit-at-eof --QUIT-AT-EOF
Quit at end of file.
-f ........ --force
Force open non-regular files.
-F ........ --quit-if-one-screen
Quit if entire file fits on first screen.
-g ........ --hilite-search
Highlight only last match for searches.
-G ........ --HILITE-SEARCH
Don't highlight any matches for searches.
-h [N] .... --max-back-scroll=[N]
Backward scroll limit.
-i ........ --ignore-case
Ignore case in searches that do not contain uppercase.
-I ........ --IGNORE-CASE
Ignore case in all searches.
-j [N] .... --jump-target=[N]
Screen position of target lines.
-J ........ --status-column
Display a status column at left edge of screen.
-k [file] . --lesskey-file=[file]
Use a lesskey file.
-K ........ --quit-on-intr
Exit less in response to ctrl-C.
-L ........ --no-lessopen
Ignore the LESSOPEN environment variable.
-m -M .... --long-prompt --LONG-PROMPT
Set prompt style.
-n -N .... --line-numbers --LINE-NUMBERS
Don't use line numbers.
-o [file] . --log-file=[file]
Copy to log file (standard input only).
-O [file] . --LOG-FILE=[file]
Copy to log file (unconditionally overwrite).
-p [pattern] --pattern=[pattern]
Start at pattern (from command line).
-P [prompt] --prompt=[prompt]
Define new prompt.
-q -Q .... --quiet --QUIET --silent --SILENT
Quiet the terminal bell.
-r -R .... --raw-control-chars --RAW-CONTROL-CHARS
Output "raw" control characters.
-s ........ --squeeze-blank-lines
Squeeze multiple blank lines.
-S ........ --chop-long-lines
Chop (truncate) long lines rather than wrapping.
-t [tag] .. --tag=[tag]
Find a tag.
-T [tagsfile] --tag-file=[tagsfile]
Use an alternate tags file.
-u -U .... --underline-special --UNDERLINE-SPECIAL
Change handling of backspaces.
-V ........ --version
Display the version number of "less".
-w ........ --hilite-unread
Highlight first new line after forward-screen.
-W ........ --HILITE-UNREAD
Highlight first new line after any forward movement.
-x [N[,...]] --tabs=[N[,...]]
Set tab stops.
-X ........ --no-init
Don't use termcap init/deinit strings.
-y [N] .... --max-forw-scroll=[N]
Forward scroll limit.
-z [N] .... --window=[N]
Set size of window.
man
NAME
less - opposite of more
SYNOPSIS
less -?
less --help
less -V
less --version
less [-[+]aABcCdeEfFgGiIJKLmMnNqQrRsSuUVwWX~]
[-b space] [-h lines] [-j line] [-k keyfile]
[-{oO} logfile] [-p pattern] [-P prompt] [-t tag]
[-T tagsfile] [-x tab,...] [-y lines] [-[z] lines]
[-# shift] [+[+]cmd] [--] [filename]...
(See the OPTIONS section for alternate option syntax with long option names.)
DESCRIPTION
Less is a program similar to more(1), but it has many more features. Less does not have
to read the entire input file before starting, so with large input files it starts up
faster than text editors like vi(1). Less uses termcap (or terminfo on some systems), so
it can run on a variety of terminals. There is even limited support for hardcopy termi‐
nals. (On a hardcopy terminal, lines which should be printed at the top of the screen are
prefixed with a caret.)
Commands are based on both more and vi. Commands may be preceded by a decimal number,
called N in the descriptions below. The number is used by some commands, as indicated.
COMMANDS
In the following descriptions, ^X means control-X. ESC stands for the ESCAPE key; for ex‐
ample ESC-v means the two character sequence "ESCAPE", then "v".
h or H Help: display a summary of these commands. If you forget all the other commands,
remember this one.
SPACE or ^V or f or ^F
Scroll forward N lines, default one window (see option -z below). 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 or RETURN or ^N or e or ^E or j or ^J
Scroll forward N lines, default 1. The entire N lines are displayed, even if N is
more than the screen size.
d or ^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 or ^B or ESC-v
Scroll backward N lines, default one window (see option -z below). 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 or ^Y or ^P or k or ^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 or ^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.
J Like j, but continues to scroll beyond the end of the file.
K or Y Like k, but continues to scroll beyond the beginning of the file.
ESC-) or 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 op‐
tion (chop lines) were in effect.
ESC-( or 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.
ESC-} or ^RIGHTARROW
Scroll horizontally right to show the end of the longest displayed line.
ESC-{ or ^LEFTARROW
Scroll horizontally left back to the first column.
r or ^R or ^L
Repaint the screen.
R Repaint the screen, discarding any buffered input. That is, reload the current
file. 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 behav‐
ior is similar to the "tail -f" command.) To stop waiting for more data, enter the
interrupt character (usually ^C). On some systems you can also use ^X.
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 or < or ESC-<
Go to line N in the file, default 1 (beginning of file). (Warning: this may be
slow if N is large.)
G or > or 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.)
ESC-G Same as G, except if no number N is specified and the input is standard input, goes
to the last line which is currently buffered.
p or % 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 { com‐
mand 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.Last updated