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That is an interesting way to find what we're looking for in bash. Looking at the bash man page, it isn't obvious to me why it works.

Unfortunately, it doesn't really work for ksh. It works the...

how about this approach [covering bash/ksh - might need to enhance it for other (zsh/sh/etc)]

#!/bin/ksh
#set -x

#echo "\$0 ->[${0}] \$# -> [${#}] \$_ -> [${_}] "
case "${0}" in
-bash)...