Thank you! The backup tip was great. I never thought of using expansion like that...

You post inspired me to quickly create two (hopefully) handy bash functions:

  # Create a backup of the given file(s)
  # USAGE: bk file1 file2 file3
  #        -> result: file1.bak file2.bak file3.bak
  bk() {
  for file in "$@"
    do
      cp $file{,.bak}
    done
  }

  # Restores the file from backup
  # USAGE: rbk file.bak OR rbk file
  #        -> result: replaces file with file.bak
  rbk() {
    if [[ $1 == *.bak ]]
    then
      backup_file=$1
      old_file=${backup_file:0:$((${#backup_file}-4))}
    else
      old_file=$1
      backup_file=${old_file}".bak"
    fi

    read -p "Replace the old backup? (y/N) " -n 2
    echo
    if [[ $REPLY =~ ^[Yy]$ ]]; then
      `cp $backup_file $old_file`
    fi
  }

I've put them in my newly created .functions file (https://github.com/pooriaazimi/dotfiles/blob/master/.functio...).