In another post I described the procedure to manually delete Time Machine snapshots and optionally shrink the disk image (in case a sparse bundle is being used) in order to free up disk space.
I have written a shell script, tm-cleanup.sh, to automate the backup deletion. The script accepts an optional argument to specify the maximum backup age in days: older backups are deleted (by default, backups older than 30 days are deleted).
The latest version of the script can be obtained by cloning its GitHub repository and, optionally, run its installation script to create symbolic links to it into /usr/local/bin:
$ sudo make install
