Linux 的计划任务学习笔记

冷不防 2022-01-16 09:41 188阅读 0赞

Linux 进行计划任务

[![image][]][image 1]

at 命令通常只能运行一次。

at 通常有后台服务atd支持，如果没有这个服务，将无法使用at

ps -ef|grep atd  
root 1815 1 0 May11 ? 00:00:00 rpc.statd  
root 2196 1 0 May11 ? 00:00:00 /usr/sbin/atd  
500 26893 32184 0 23:09 pts/1 00:00:00 grep atd

\[windriver@windriver-machine pne2.0\]$ /etc/init.d/atd status  
atd (pid 2196) is running...

[![image][image 2]][image_image 2]

at创建新的任务不需要root权限，便删除需要root权限 atrm

\[windriver@windriver-machine ATCA\_7150\_prj\]$ atq  
1 Thu Jun 2 23:14:00 2011 = windriver  
2 Thu Jun 2 23:20:00 2011 a windriver  
\[windriver@windriver-machine ATCA\_7150\_prj\]$ atq  
1 Thu Jun 2 23:14:00 2011 = windriver  
2 Thu Jun 2 23:20:00 2011 a windriver  
\[windriver@windriver-machine ATCA\_7150\_prj\]$ atrm 2  
Cannot unlink a00002014c64f8: Permission denied  
\[windriver@windriver-machine ATCA\_7150\_prj\]$ atrm 1  
Warning: deleting running job  
Cannot unlink =00001014c64f2: Permission denied  
\[windriver@windriver-machine ATCA\_7150\_prj\]$ su root  
Password:  
\[root@windriver-machine ATCA\_7150\_prj\]\# atq  
1 Thu Jun 2 23:14:00 2011 = windriver  
2 Thu Jun 2 23:20:00 2011 a windriver  
\[root@windriver-machine ATCA\_7150\_prj\]\# atrm 2  
\[root@windriver-machine ATCA\_7150\_prj\]\# atq  
1 Thu Jun 2 23:14:00 2011 = windriver  
\[root@windriver-machine ATCA\_7150\_prj\]\# atrm 1  
Warning: deleting running job  
\[root@windriver-machine ATCA\_7150\_prj\]\# atq  
\[root@windriver-machine ATCA\_7150\_prj\]\#

[![image][image 3]][image_image 3]

batch 创建的任务一般是CPU利用低的情况才会执行、

[![image][image 4]][image_image 4]

[![image][image 5]][image_image 5]

转载于:https://blog.51cto.com/acreep/612231

[image]: https://s1.51cto.com/attachment/201107/15/3333560_1310721182hDRe.png
[image 1]: https://s1.51cto.com/attachment/201107/15/3333560_1310721179tPo0.png
[image 2]: https://s1.51cto.com/attachment/201107/15/3333560_1310721191jFKE.png
[image_image 2]: https://s1.51cto.com/attachment/201107/15/3333560_1310721188l74s.png
[image 3]: https://s1.51cto.com/attachment/201107/15/3333560_13107211982xdn.png
[image_image 3]: https://s1.51cto.com/attachment/201107/15/3333560_1310721195Xbwm.png
[image 4]: https://s1.51cto.com/attachment/201107/15/3333560_1310721203aEuL.png
[image_image 4]: https://s1.51cto.com/attachment/201107/15/3333560_1310721201rGco.png
[image 5]: https://s1.51cto.com/attachment/201107/15/3333560_1310721209Kkau.png
[image_image 5]: https://s1.51cto.com/attachment/201107/15/3333560_1310721206mMzi.png