Linux cleanup space

Linux Individual directory Space cleanup
var space cleanup
/var/spool/clientmqueue
The original/var/spool/clientmqueue is if there are users in the system to open cron, and cron execution of the program has output content, the output will be sent to cron users in the mail, and SendMail did not start to produce these files.
The server does have cron timed to execute dozens of scripts, and none of the output orientations are set, and the accumulated files are saved in the/var/spool/clientmqueue directory under le = =.
* * 4 root cd/var/spool/clientmqueue && ls |xargs rm-f

Workaround: Add >/dev/null after cron automatically executes the statement 2>&1
Cases:
4 3 * * */usr/bin/w >/dev/null 2>&1
This will be OK to pull, will not write to that directory ....
/var/spool/mail/
Message information in this directory

Linux cleanup space