1 files changed, 11 insertions, 2 deletions

diff --git a/dmenu-filepicker b/dmenu-filepicker
index e2642b2..288cac9 100755
--- a/dmenu-filepicker
+++ b/dmenu-filepicker
@@ -2,20 +2,29 @@
 
 # A dmenu-based file picker (prints selected file to stdout)
 # Requires: dmenu (or similar)
+
 # Usage: dmenu-filepicker [-m menu] [path]
 
 menu="dmenu -i -l 15"
 
+usage() {
+        echo "Usage: dmenu-filepicker [-m MENU] [PATH]"
+}
+
 while getopts "m:" opt; do
         case "$opt" in
                 m)
                         menu="$OPTARG"
                         ;;
+                *)
+                        usage
+                        exit 1
+                        ;;
         esac
 done
-shift `expr $OPTIND - 1`
+shift $((OPTIND - 1))
 
-fullpath=$(realpath ${@:-"$(pwd)"})
+fullpath=$(realpath "${@:-"$(pwd)"}")
 
 while true; do
         if [ "$sel" = "." ]; then