Recovery and precaution of crontab deletion operation

1, crontab-r Delete operation of the recovery

Statement resolution: CRONTAB-E Edit and Crontab-r Delete, because E, R on the keyboard is next to, once the misoperation crontab-r will delete each user's timed task.

How to retrieve a task: You can view the statement that executes the task by looking for a crontab log file. Then, rebuild the crontab file and restore it.

Log file directory:/var/log.

View methods: ls/var/log/cron*, Cat Cronlog | grep matches keywords, and so on.

2, prevent the false deletion method

Method: The alias is established by Crontab, that is, alias, when the user input crontab is detected, the/usr/bin/cron.sh is invoked to judge the user's operation and avoid accidental deletion.

The realization method of the online script is given: https://yq.aliyun.com/ziliao/78389 for reference.