The while-loop¶
Synopsis¶
while <LIST1> ; do
<LIST2>
done
Description¶
The while-loop is relatively simple in what it does: it executes the command list <LIST1>
and if the exit code of it was 0 (TRUE) it executes <LIST2>
. This happens again and again until <LIST1>
returns FALSE.
This is exactly the opposite of the until loop.
:!: Like all loops (both for
-loops, while
and until
), this loop can be
- terminated (broken) by the
break
command, optionally asbreak N
to breakN
levels of nested loops - forced to immediately do the next iteration using the
continue
command, optionally ascontinue N
analog tobreak N
Return status¶
The return status is the one of the last command executed in <LIST2>
, or 0
(TRUE
) if none was executed.
Examples¶
Portability considerations¶
See also¶
- Internal: The until loop
- Internal: code examples of the read builtin command to see how you can loop over lines