#!/bin/bash
# cmp_dir - program to compare two directories
# Check for required arguments
if [ $# -ne 2 ]; then
     echo "usage: $0 directory_1 directory_2"
     exit 1
fi
# Make sure both arguments are directories
if [ ! -d $1 ]; then
     echo "$1 is not a directory!"
     exit 1
fi
if [ ! -d $2 ]; then
     echo "$2 is not a directory!"
     exit 1
fi
# Process each file in directory_1, comparing it to directory_2
missing=0
for filename in $1/*; do
      fn=$(basename $filename)
      if [ -f $filename ]; then
            if [ ! -f $2/$fn ]; then
                  echo "$fn is missing from $2"
                  missing=$((missing + 1))
            fi
     fi
done
echo "$missing files missing"