Shell function that test a command in all installed shells and captures+displays the output. Should work with both ksh93 and bash.

shtest.fun

function shtest
{
    # Will run the given command in all avaliable shells and capture and
    # display the output generated on standard output as well as any
    # diagnostic messages generated on standard error, together with the
    # exit code.

    grep '^[^#]' /etc/shells | (
    typeset -a tmpfiles
    trap 'rm -f "${tmpfiles[@]}"' EXIT
    while read realshell; do
        typeset shell="${realshell##*/}"

        typeset tmpout="$( mktemp -p /tmp "$shell-out.XXXXXXXX" )"
        typeset tmperr="$( mktemp -p /tmp "$shell-err.XXXXXXXX" )"

        tmpfiles+=( "$tmpout" "$tmperr" )

        command "$realshell" -c "$@" 1>"$tmpout" 2>"$tmperr"
        err="$?"

        printf '=== %s (exit %d)\n' "$shell" "$err"
        echo "--- stdout:"
        cat "$tmpout"
        echo "--- stderr:"
        cat "$tmperr"
    done )
}


# vim: ft=sh