Scaled up: case "$1" in *0|*2|*4|*6|*8) echo even;; *) echo odd;; esac If $1 had a trailing non-digit, or was empty, that would indeed be an odd s

Scaled up: case "$1" in *0|*2|*4|*6|*8) echo even;; *) echo odd;; esac If $1 had a trailing non-digit, or was empty, that would indeed be an odd situation!