NAMEcmdwatch - execute a program periodically, showing output fullscreen
SYNOPSIScmdwatch [-dhv] [-n <seconds>] [--differences[=cumulative]] [--help] [--interval=<seconds>] [--version] <command>
DESCRIPTIONcmdwatch 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 different interval.
The -d or --differences flag will highlight the differences between successive updates. The --differences=cumulative option makes highlighting "sticky", presenting a running display of all positions that have ever changed.
cmdwatch will run until interrupted.
NOTENote 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 cmdwatch itself.
EXAMPLESTo watch for mail, you might do
To watch the contents of a directory change, you could use
If you're only interested in files owned by user joe, you might use
To see the effects of quoting, try these out
You can watch for your administrator to install the latest kernel with
BUGSUpon terminal resize, the screen will not be correctly repainted until the next scheduled update. All --differences highlighting is lost on that update as well.
Non-printing characters are stripped from program output. Use "cat -v" as part of the command pipeline if you want to see them.
AUTHORSThe original watch was written by Tony Rems <email@example.com> in 1991, with mods and corrections by Francois Pinard. It was reworked and new features added by Mike Coleman <firstname.lastname@example.org> in 1999. This man page based on the watch man page of the Linux User's Manual.
Visit the GSP FreeBSD Man Page Interface.