The command “ps -ef -o ppid,pid” will list ONLY process IDs and parent process IDs (i.e., PIDs and PPIDs). For an example, the following command will print the parent of the mountd process.

OS X comes with three Unix maintenance scripts — daily, weekly, and monthly — which you see in the default system crontab. These scripts are already scheduled to run on a daily, weekly, and ...

The userdel command might not remove cron files and usermod is unlikely to make any changes until the cron daemon is restarted — and maybe not even then.