-is_installed() {
- prog="$1"
- [ -z "$prog" ] && return 1
-
- ret=1
- oifs="$IFS"
- IFS=:
- for dir in $PATH; do
- [ -z "$dir" ] && continue
- [ -x "$dir/$prog" ] && ret=0 && break
- done
-
- IFS="$oifs"
- unset oifs
- return "$ret"
-}
-
-if is_installed "$PROG" 1>/dev/null 2>&1 ; then
- exec $@