Linux 的计划任务学习笔记

原创

hbxu 2011-07-15 17:14:07 ©著作权

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Linux 进行计划任务

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...

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]#