watch

Question 1

watch

Answer 1

watch runs a command repeatedly, displaying its output and errors (the first screenfull).

Question 2

watch

• d
• n
• p
• t
• b

Answer 2

• d, –differences [permanent], Highlight the differences between successive updates.
• n, –interval seconds, Specify update interval.
• p, –precise, Make watch attempt to run command every interval seconds.
• t, –no-title, Turn off the header.
• b, –beep, Beed if command has a non-zero exit.

Question 3

watch

• e
• g
• c
• x

Answer 3

• e, –errexit, Freeze updates on command error, and exit after a key press.
• g, –chgexit, Exit when the output of command changes.
• c, –color, Interpret ANSI color and style sequences.
• x, –exec, Pass command to exec instead of sh -c which reduces the need to use extra quoting to get the desired effect.