Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

My CUPS server has bad, obsolete data in /var/cups/cache. I could just blow away all the files, but I'd like to know if there is a "correct" way to clear the CUPS cache. Man pages and Google have not yielded an answer.

share|improve this question
up vote 9 down vote accepted

According to CUPS documentation, the standard config places cache files in /var/spool/cups/cache and print jobs in /var/spool/cups. I'd imagine the best strategy is either of the following:

  1. Clear it with specific CUPS commands. Unfortunately there's not a builtin command to clear the cache; only enabling/disabling specific print queues and removing specific print jobs seem to be available.

    Use lpq (to view the queues), lprm, and cancel, or the web interface, to view current jobs and remove them. cancel -a should cancel all jobs on all queues.

    If your system is hosed by defined printers and queues, deleting those objects may help. Use lpadmin or the web interface to manage defined printers.

  2. Clear it manually, by:
    1. stopping CUPS (eg, sudo service cups stop),
    2. removing files manually, and
    3. restarting CUPS (eg, sudo service cups start).

This long thread suggests that /var/spool/cups contains completed print jobs while /var/spool/cups/tmp contains in-progress jobs. One post to that thread suggests running sudo rm -r /var/spool/cups in step 2.2 above. Steps 2.1 and 2.3 show Ubuntu commands for stopping and starting services; other OS's will vary.

If you really need to delete cache files in /var/cache/cups, you will probably need to use the manual method.

share|improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .