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    By far the best answer yet too many people don't use parameter expansion. This works on arrays too, incl $@: params=("${@##*[!0-9]*}") -- Keep all positional arguments, but only use numbers - anything else will be converted to null string which conveniently evaluates to 0 in arithmetic evaluations (my use case - function parameter is a list of integers, unset or null should default to 0 but caller sets variable name when unset). Commented Apr 22, 2020 at 13:13
  • getting this to work for all integers, not just non-negative, is trickier because of edge cases like scale=1-2. how to handle such a case depends on the application. Commented Mar 22, 2024 at 14:50