Mac TimeMachine Backup Maintenance

Original Source:

http://apple.stackexchange.com/questions/39287/how-can-i-manually-delete-old-backups-to-free-space-for-time-machine/55646

Short notes:

1. COMPUTER_NAME=$(/usr/sbin/scutil --get ComputerName)
2. OLDEST_BACKUP=$(/usr/bin/tmutil listbackups |/usr/bin/grep "$COMPUTER_NAME" |/usr/bin/head -n1);echo $OLDEST_BACKUP

3. sudo /usr/bin/tmutil delete "$OLDEST_BACKUP"

Checks: 

1. NBACKUPS=$(/usr/bin/tmutil listbackups | /usr/bin/grep "$COMPUTER_NAME" | /usr/bin/wc -l); echo $NBACKUPS

2. LATEST_BACKUP=$(/usr/bin/tmutil latestbackup); echo Latest backup: $LATEST_BACKUP

From the apple stackexchange:

COMPUTER_NAME=$(/usr/sbin/scutil --get ComputerName)
NBACKUPS=$(/usr/bin/tmutil listbackups | /usr/bin/grep "$COMPUTER_NAME" | /usr/bin/wc -l)
OLDEST_BACKUP=$(/usr/bin/tmutil listbackups | /usr/bin/grep "$COMPUTER_NAME" | /usr/bin/head -n1)
LATEST_BACKUP=$(/usr/bin/tmutil latestbackup)
echo Latest backup: $LATEST_BACKUP
if [[ -n "$LATEST_BACKUP" && "$LATEST_BACKUP" != "$OLDEST_BACKUP" ]] then
  echo -n "$NBACKUPS backups. Delete oldest: ${OLDEST_BACKUP##*/} [y/N]? "
  read answer
  case $answer in
    y*)
      echo Running: /usr/bin/sudo /usr/bin/tmutil delete "$OLDEST_BACKUP"
      /usr/bin/sudo time /usr/bin/tmutil delete "$OLDEST_BACKUP"
      ;;
    *)
      echo No change
      ;;
  esac
 else
   echo "No backup available for deletion"
 fi