How do I compare file names in two directories in shell script?

Question

Right now, this is what my code looks like:

#!/bin/bash

Dir1=$1
Dir2=$2

for file1 in $Dir1/*; do
    for file2 in $Dir2/*; do
        if [[ $file1 == $file2 ]]         


        

Answer 1

It doesn't work because you're comparing variables that contain the directory prefix. Just remove the prefix before comparing:

name1=${file1##*/}
name2=${file2##*/}
if [[ $name1 == $name2 ]]; then
    echo "$name1 exists in both directories"
fi

Also, nested loops seems like an inefficient way to do this. You just need to get the filenames from one directory, and use a simple file existence check for the other directory.

for file in $Dir1/*; do
    name=${file##*/}
    if [[ -f $Dir2/$name ]]; then
        echo "$name exists in both directories"
    fi
done