Watch

watch is a command to observe the output of a command as it is repeated over time. The terminal is filled with the output as it updates.

Defaults:

• keeps repeating until the program is interrupted.
• inteval of 2 seconds

Options

• -d --differences [permanent]

 Highlights differences since the last update, or from the beginning.

• -n --interval seconds

 Sets the update interval

• -p --precise

 Tries hard to keep the interval precise (see [ntptime])

• -t --no-title

 Turn off the header.

• -b --beep

 Beep if command has a non-zero exit code.

• -e --errorexit

 Freeze updates if the command has a non-zero exit code, and exit on any key press.

• -g --chgexit

 Exit when the output changes

• -c --color

 Interpret ANSI color sequences

• -x --exec

 Command is given to [sh] -c (requires special quoting)

• -h --help

 Display hellp and exit

• -v --version

 Display version and exit