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watch




SYNOPSIS

       watch [-dhvt] [-n <seconds>]  [--differences[=cumulative]]
       [--help]  [--interval=<seconds>]  [--no-title] [--version]
       <command>


DESCRIPTION

       watch runs command repeatedly, displaying its output  (the
       first  screenfull).   This allows you to watch the program
       output change over time.  By default, the program  is  run
       every 2 seconds; use -n or --interval to specify a differ­
       ent interval.

       The -d or --differences flag will  highlight  the  differ­
       ences between successive updates.  The --cumulative option
       makes highlighting "sticky", presenting a running  display
       of  all positions that have ever changed.  The -t or --no-
       title option turns off the header  showing  the  interval,
       command,  and  current  time at the top of the display, as
       well as the following blank line.

       watch will run until interrupted.


NOTE

       Note that command is given to "sh -c" which means that you
       may need to use extra quoting to get the desired effect.

       Note  that  POSIX  option processing is used (i.e., option
       processing stops at the first non-option argument).   This
       means  that  flags  after command don't get interpreted by
       watch itself.


EXAMPLES

       To watch for mail, you might do

              watch -n 60 from

       To watch the contents of a directory change, you could use

              watch -d ls -l

       If  you're only interested in files owned by user joe, you
       might use

              watch -d 'ls -l | fgrep joe'

       To see the effects of quoting, try these out

              watch echo $$

              watch echo '$$'

       Non-printing  characters are stripped from program output.
       Use "cat -v" as part of the command pipeline if  you  want
       to see them.


AUTHORS

       The    original   watch   was   written   by   Tony   Rems
       <rembo@unisoft.com> in 1991, with mods and corrections  by
       Francois  Pinard.   It was reworked and new features added
       by Mike Coleman <mkc@acm.org> in 1999.

                            1999 Apr 3                   WATCH(1)
  
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