wiki.bash-hackers.org/syntax/ccmd/until_loop.md

====== The until loop ======

===== Synopsis =====
<code>
until <LIST1> ; do
  <LIST2>
done
</code>

===== Description =====
The until-loop is relatively simple in what it does: it executes the [[syntax:basicgrammar#lists | command list]] ''<LIST1>'' and if the exit code of it was **not** 0 (FALSE) it executes ''<LIST2>''. This happens again and again until ''<LIST1>'' returns TRUE.

This is exactly the opposite of the [[syntax:ccmd:while_loop | while loop]].

:!: Like all loops (both ''for''-loops, ''while'' and ''until''), this loop can be
  * terminated (broken) by the ''break'' command, optionally as ''break N'' to break ''N'' levels of nested loops
  * forced to immediately do the next iteration using the ''continue'' command, optionally as ''continue N'' analog to ''break 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: [[syntax:ccmd:while_loop | The while loop]]