dash3.md

- && (conditional loop)

Sometimes you need to use a loop. But the loop should be executed only if conditions of a block matche.

To do so, use - && magic:

DBS='mysql pgsql'

@ Installing databases
  when is not empty_var DBS
  - && for db in $DBS; do yum_install $db; done

Of course, the for loop will work also without the - &&, but then it will execute always, even if the block conditions wouldn't match.

See also

- COMMAND
- VARIABLE = VALUE
and_when
or_when
@
ignore_errors