OS UNIX - Задача 3 - Exercises

#!/bin/bash

# Function for comparing two files
function compareFiles {
        if diff $1 $2 >/dev/null; then
                echo true
        else
                echo false
        fi
}

# Arguments check
if [[ $# -lt 3 ]]; then
        echo "Usage: `basename $0` source_folder/ destination_folder/"
        exit 1
fi

# Source directory existence check
if [[ ! -d $1 ]]; then
        echo "Source directory is not existing on the file system."
        exit 1
fi

# Destination directory existence check
if [[ -d $2 ]]; then
        rm -r $2
        mkdir $2
else
        mkdir $2
fi

# Variables
files=()
count=0

# Listing the content from $1 (source) directory
for file in `find $1 -type f`; do
        files[((count++))]=$file
done

# Iterating the memory stored files
echo "" > $3
for file in ${files[@]}; do
        filename=$(echo $file | sed 's/\//__/g')
        destination="${2}${filename}"
        cp $file $destination
        for copiedFile in `find $2 -type f`; do
                check=$(compareFiles $file $copiedFile)
                if [[ ${check} = true ]]; then
                        echo "$file $copiedFile" >> $3
                fi
        done
done