#!/bin/bash

# toggles whether a file or group of files is executable

for FILE in "$@";do
   if [  -x "$FILE" ];then
      chmod -x "$FILE" &&
         echo -e "$FILE: -x"
   elif ! [ -x "$FILE" ];then
      chmod +x "$FILE" &&
         echo -e "$FILE: +x"
   else
      echo "error: file $FILE does not exist" >&2
   fi
done