During Linux configuration, use crontab and configure crontab in linux.

During Linux configuration, use crontab and configure crontab in linux.

In Linux, we all know how to use the crontab system function to configure scheduled tasks. However, sometimes we need to differentiate user execution. The following describes the differences between the two methods:

Method 1:

Run the crontab-e command to directly edit the scheduled script.

After this execution, the User-Defined file will be written to the/var/spool/cron directory to generate a file consistent with the user name. The file content is the scheduled script We edited.

For example:

[Root @ localhost cron. d] # cd/var/spool/cron [root @ localhost cron] # ll total usage 4-rw -------. 1 root 52 December 9 10:58 root [root @ localhost cron] # pwd/var/spool/cron [root @ localhost cron] # cat root 30 03 ***/root/automysqlbackup. sh

Method 2:

Run the command vi/etc/crontab to edit the scheduled script.

For example:

[root@localhost ~]# cat /etc/crontab                                                                                                                                                                      SHELL=/bin/bash                                                                                                                                                                                           PATH=/sbin:/bin:/usr/sbin:/usr/bin                                                                                                                                                                        MAILTO=root                                                                                                                                                                                               HOME=/                                                                                                                                                                                                                                                                                                                                                                                                              # run-parts                                                                                                                                                                                               30 * * * * root /usr/sbin/ntpdate 210.72.145.44                                                                                                                                                           #30 8 * * * root /usr/sbin/ntpdate 132.228.90.101                                                                                                                                                         01 * * * * root run-parts /etc/cron.hourly                                                                                                                                                                02 4 * * * root run-parts /etc/cron.daily                                                                                                                                                                 22 4 * * 0 root run-parts /etc/cron.weekly                                                                                                                                                                42 4 1 * * root run-parts /etc/cron.monthly                                                                                                                                                               */1 * * * * root run-parts /opt/openoffice.org3/program/start.sh                                                                                                                                          ############################################                                                                                                                                                                                                                                                                                                                                                                        30 4 * * * root /usr/bin/rsync -vzrtopg --progress --delete root@192.168.231.35::resource /hyy/bak/resource 30 4 * * * root /usr/bin/rsync -vzrtopg --progress --delete root@192.168.231.35::log /hyy/bak/log############################################[root@localhost ~]# 

For system-level configuration, We will directly Configure/etc/crontab.

Generally, we recommend that you use crontab-e to check the script syntax we configured.