Shulou(Shulou.com)06/02 Report--

It is very common to use crontab timers in normal server management, but you should pay attention to a few points when using them:

1. Pay attention to the 5 * words in the crontab format. Do not make mistakes. Find a picture on the Internet that can directly identify the value of the * of crontab:

2. If sendmail is not started in the system after crontab is enabled, when the program executed in crontab has output, the output will be sent to the user in the form of e-mail, and the accumulated files will be saved in the / var/spool/clientmqueue directory. We can usually add > / dev/null 2 > & 1 to the statement with output, but sometimes there will always be omissions. Then we can use a small script to clean it up every three days.

00 1 * / 3 * * / usr/local/scripts/delmail.sh [root@test scripts] # cat delmail.shemail.Bingray BASHCD / var/spool/clientmqueue/ls | xargs rm-rvf

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