Easy way of pruning pg_data?

Hi All
given the folowing:

ls -l pg_data/base
drwx--S---    2 postgres postgres     2048 Apr 15  2001 1
drwx--S---    2 postgres postgres     2048 Aug 27 12:26 1007014
drwx--S---    2 postgres postgres     2048 Sep 15 08:57 1045851
drwx--S---    2 postgres postgres     2048 Apr 15  2001 18719
drwx--S---    2 postgres postgres     2048 Apr 15  2001 18735
drwx--S---    2 postgres postgres     2048 Apr 15  2001 18891
drwx--S---    2 postgres postgres     2048 Apr 15  2001 18916
drwx--S---    2 postgres postgres     4096 Oct 12 20:09 19100
drwx--S---    2 postgres postgres     2048 Apr 15  2001 192660
drwx--S---    2 postgres postgres     2048 Apr 15  2001 206353
drwx--S---    2 postgres postgres     2048 Apr 15  2001 206889
drwx--S---    2 postgres postgres     2048 Apr 15  2001 207360
drwx--S---    2 postgres postgres     2048 Jun  5 10:44 639889
drwx--S---    2 postgres postgres     2048 Jun  5 11:19 643727
drwx--S---    2 postgres postgres     2048 Aug  1 12:28 953493

Is there an easy way to housekeep (prune) these directories?
Thanks in advance
Lee