Unix in a Nutshell, 4th Edition

Name

watch

Synopsis

    watch [options] command [cmd_options]

Run the specified command repeatedly (by default, every 2 seconds) and display the output so you can watch it change over time. The command and any options are passed to sh -c, so you may need to use quotes to get correct results.

Options

-d, --differences[=cumulative]

Highlight changes between iterations. If cumulative is specified, the highlighting remains on the screen throughout, giving a cumulative picture of the changes.

-h, --help

Display help message and exit.

-nsecs, --interval=secs

Run the command every secs seconds.

-t, --no-title

Do not print a header line.

-v, --version

Print version information and exit.