It is actually documented further down in the man page and by the linux- foundation.org that these files can have dots, in fact, multiple dots to accomodate dns domain names.
** Changed in: cron (Ubuntu) Status: Invalid => Confirmed -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to cron in Ubuntu. https://bugs.launchpad.net/bugs/706565 Title: configs with dots in file name not working in /etc/cron.d Status in “cron” package in Ubuntu: Confirmed Bug description: Binary package hint: cron I configured cron jobs with config file: /etc/cron.d/job.cron and it not working. I spend couple of hours to understand the problem. Fix is to rename file withowt dots in the name: /etc/cron.d/job is working. Renaming back to job.cron or other name with the dot in the name cause cron to not read this file. I just switched to Ubuntu Server from Fedora and it works before on those distributive. I can't find any error messages in syslog event with -L9 command line in cron daemon. I can't find any warning in man page or readme document about file names. I think there are 2 possible ways to fix this: 1) put a WARNING about file names with dots (like "myjob.cron") in manpage; 2) make cron working with those files as other distro do (ex. Fedora) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cron/+bug/706565/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp