backup.sh

# 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]
targetDirectory="$1"
destinationDirectory="$2"

# [TASK 2]
echo "Target Directory: $targetDirectory"
echo "Destination Directory: $destinationDirectory"

# [TASK 3]
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 $destinationDirectory # <-
destDirAbsPath=$(pwd)

# [TASK 7]
cd $origAbsPath # <-
cd $targetDirectory # <-

# [TASK 8]
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) # [TASK 11]
  fi
done

# [TASK 12]
tar -cvf $backupFileName $toBackup
# [TASK 13]
mv $backupFileName $destDirAbsPath
# Congratulations! You completed the final project for this course!

# Just one more line to test git workflow