Differences and usage scenarios between Linux Systemd Crontab
Under the Linux operating system, there are two common scheduled task tools, namely Systemd and Crontab. Although both tools can be used to perform scheduled tasks, they have some differences in some details and usage scenarios.
Systemd's scheduled task configuration file is generally placed in the /etc/systemd/system
directory, with the suffix name .timer
. The following is a configuration example of a Systemd scheduled task:
[Unit] Description=My Timer [Timer] OnCalendar=*-*-* 00:00:00 Persistent=true [Install] WantedBy=timers.target
In the above configuration file, the OnCalendar
field specifies the task execution time, which means it is executed once every day at zero o'clock. The Persistent
field specifies whether the task is saved and continued at the next startup.
We can edit the user's crontab configuration file through the crontab -e
command. The following is a configuration example of a Crontab scheduled task:
0 0 * * * /path/to/script.sh
The above configuration represents the daily Execute the script.sh
script under the specified path at 0:00.
Comparison of two scheduled task tools:
.timer
and is placed in the /etc/systemd/system
directory; Crontab's configuration file is user crontab file, edit it through crontab -e
. Based on the above differences, we can choose appropriate scheduled task tools to meet different needs and scenarios. If it is just simple scheduled task scheduling, Crontab is enough to meet your needs; if you need complex management and scheduling of system services, Systemd is a better choice.
Summary:
Systemd and Crontab are both common scheduled task tools. There are some differences in their usage, configuration files and functions. Choosing which tool to use mainly depends on the complexity and requirements of the task. Proficient in using these two tools will bring convenience to our system maintenance and task scheduling.
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