@hanno @yossarian Yeah this was a common recommendation long ago to "avoid bash-isms" for compatibility. Since then busybox and dash (the common non-bash "/bin/sh" instances) grew '[' support either internally or via /usr/bin/[

@yossarian The use of '[[' is the problem. That's an evaluating comparison and is as dangerous as 'eval' (as shown). All scripts should be using just the single '['. Using '[[' is for compatibility with ancient shells.