jless(1) - opposite of more
-? or --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 or --search-skip-screen
       Causes searches to start after the last line displayed on the  screen,  thus  skipping  all  lines
       displayed  on  the  screen.  By default, searches start at the second line on the screen (or after
       the last found line; see the -j option).
-bn or --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 is read into memory.
-B or --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 file is kept in
       memory; any earlier data is lost.
-c or --clear-screen
       Causes full screen repaints to be painted from  the  top  line  down.   By  default,  full  screen
       repaints are done by scrolling from the bottom of the screen.
       The -C option is like -c, but the screen is cleared before it is repainted.
-d or --dumb
       The  -d  option  suppresses the error message normally displayed if the terminal is dumb; that is,
       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.
-Dxcolor or --color=xcolor
       [MS-DOS  only]  Sets  the  color of the text displayed.  x is a single character which selects the
       type of text whose color is being set: n=normal, s=standout, d=bold, u=underlined, k=blink.  color
       is a pair of numbers separated by a period.  The first number selects the foreground color and the
       second selects the background color of the text.  A single number N is the same as N.0.
-e or --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.
       Causes less to automatically exit the first time it reaches end-of-file.
-f or --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.
-F or --quit-if-one-screen
       Causes less to automatically exit if the entire file can be displayed on the first screen.
-g or --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.
       The -G option suppresses all highlighting of strings found by search commands.
-hn or ---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 or --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.
       Like -i, but searches ignore case even if the pattern contains uppercase letters.
-jn or --jump-target=n
       Specifies  a line on the screen where the "target" line is to be positioned.  A target line is the
       object of a text search, tag search, jump to a line number, jump to a file percentage, or jump  to
       a marked position.  The screen line is 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.  If the -j
       option is used, searches begin at the line immediately after the target  line.   For  example,  if
       "-j4"  is  used,  the target line is the fourth line on the screen, so searches begin at the fifth
       line on the screen.
-J or --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.
-kfilename or --lesskey-file=filename
       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 or --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.
       Causes  less  to  use this charset instead of a charset defined in the JLESSCHARSET or LESSCHARSET
       environment variable.
-m or --long-prompt
       Causes less to prompt verbosely (like more), with the percent into the  file.   By  default,  less
       prompts with a colon.
       Causes less to prompt even more verbosely than more.
-n or --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).
       Causes a line number to be displayed at the beginning of each line in the display.
-ofilename or --log-file=filename
       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.
-Ofilename or --LOG-FILE=filename
       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.
-ppattern or --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.
-Pprompt or --prompt=prompt
       Provides a way to tailor the three prompt styles  to  your  own  preference.   This  option  would
       normally  be put in the LESS and JLESS environment variables, rather than being typed in with each
       less command.  Such an option must either be the last option in the LESS and JLESS  variables,  or
       be  terminated  by  a dollar sign.  -Ps followed by a string changes the default (short) prompt to
       that 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.
-q or --quiet or --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.
-Q or --QUIET or --SILENT
       Causes totally "quiet" operation: the terminal bell is never rung.
-r or --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.
       Like -r, but tries to keep track of the screen appearance where possible.  This works only if  the
       input consists of normal text and possibly some ANSI "color" escape sequences, which are sequences
       of the form:

            ESC [ ... m

       where the "..." is zero or more characters other than "m".  For the purpose of  keeping  track  of
       screen  appearance,  all control characters and all 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.
-s or --squeeze-blank-lines
       Causes consecutive blank lines to be squeezed into a single  blank  line.   This  is  useful  when
       viewing nroff output.
-S or --chop-long-lines
       Causes  lines longer than the screen width to be chopped rather than folded.  That is, the portion
       of a long line that does not fit in the screen width is not shown.  The default is  to  fold  long
       lines; that is, display the remainder on the next line.
-ttag or --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.  If the
       environment variable LESSGLOBALTAGS is set, it is taken to be the name  of  a  command  compatible
       with    global    (1),    and    that    command    is   executed   to   find   the   tag.    (See
       http://www.gnu.org/software/global/global.html).  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.
-Ttagsfile or --tag-file=tagsfile
       Specifies a tags file to be used instead of "tags".
-u or --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.
       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.
-V or --version
       Displays the version number of less.
-w or --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.
       Like  -w,  but temporarily highlights the first new line after any forward movement command larger
       than one line.
-xn,... or --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.
-X or --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
       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.
-yn or --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.
-Y     Causes mark characters to  be  used  to  represent  wrong  characters.   By  default,  such  wrong
       characters displayed as binary.
-Z     Causes to give priority to the SJIS over the UJIS if a "japanese" was selected by the JLESSCHARSET
       environment variable.  The default value is to give priority to the UJIS over the SJIS.
-# or --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.