LINUX fault and troubleshooting example

An example of LINUX faults and troubleshooting-Linux general technology-Linux technology and application information. The following is a detailed description. The backup command is automatically executed twice, but only one is added to crontab-l.

The automatically executed command can be used in each user. The crontab-l is used to find one because the other is added to the common user, I only check the root user's daemon. find out what commands are automatically run and when they are run. You can search for them at/var/log/cron. Note that if the command is run, you also need to find out who is running the command, and then find it in the user environment.

The command to restart crond is/etc/init. d/crond restart.

The general cause of this problem is the user's environment variables and file permissions.