Continuously re-execute a command when it finishes in Bash

The watch command will repeat a command forever with an interval specified:

watch -n0 <command>

Setting -n to zero effectively puts the interval at nothing (I think it is really .1 seconds).

watch also has the added benefits of aligning the output so visual changes can be seen easily, and has a switch to highlight changes from the last run.

Reference: the watch man page:

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 different interval.

watch will run until interrupted.

This creates an infinite loop, executing command over and over again.

while :
do
    command
done

A simple solution would be:

yourcommand; !#

; separates commands, allowing for multiple commands in one line (Bash: Lists)

!# tells bash to "repeat everything I have written so far in this line" (Bash: Event-Designators)