On Fri, Jul 03, 2020 at 07:00:54PM +0100, Chris Elvidge wrote: > I've used 'return $((!$#))' and 'return $[!$#]' to return an error if no > parameters given to function.
The problem with this is that it *always* returns from the function, even when paramters are given. If you actually want to do what you said, you need a conditional check of some kind, either "if" or "||". (($#)) || return 1 would be my preference, if you really do not want to give any kind of error message to indicate *why* you are returning with a failure code. If you want to add an error message, then I would go with "if". if ((! $#)); then echo "usage: myfunc arg1 ..." >&2 return 1 fi
