backup.sh

#!/bin/bash

# This checks if the number of arguments is correct
# If the number of arguments is incorrect ( $# != 2) print error message and exit
if [[ $# != 2 ]]
then
  echo "backup.sh target_directory_name destination_directory_name"
  exit
fi

# This checks if argument 1 and argument 2 are valid directory paths
if [[ ! -d $1 ]] || [[ ! -d $2 ]]
then
  echo "Invalid directory path provided"
  exit
fi

# [TASK 1]
# Встановлення змінних з аргументів командного рядка
targetDirectory="$1"
destinationDirectory="$2"

# [TASK 2]
echo "targetDirectory"
echo "destinationDirectory"

# [TASK 3]
# Отримання поточного часу
currentTS=$(date +"%s")


# [TASK 4]
backupFileName="backup-$currentTS.tar.gz"


# We're going to:
  # 1: Go into the target directory
  # 2: Create the backup file
  # 3: Move the backup file to the destination directory

# To make things easier, we will define some useful variables...

# [TASK 5]
origAbsPath=$(pwd)

# [TASK 6]
cd $destinationDirectory
destAbsPath=$(pwd)

# [TASK 7]
cd $origAbsPath 
cd $targetDirectory

# [TASK 8]
# Встановлення часу 24 години тому
yesterdayTS=$((currentTS - 24 * 60 * 60))

declare -a toBackup

for file in $(ls) # [TASK 9]
do
  # [TASK 10]
  if ((`date -r $file +%s` > $yesterdayTS))
  then
    toBackup+=("$file")
  fi
done

# [TASK 12]

tar -czvf "$backupFileName" "${toBackup[@]}"


# [TASK 13]
mv $backupFileName $destAbsPath

# Congratulations! You completed the final project for this course!