Linux:后台命令crontab、at
1、crontab使用举例
每天23:00向/tmp/datecon.log文件中写入系统日期
kevin@kevin:/opt/d00148588$ crontab -l
no crontab for kevin
kevin@kevin:/opt/d00148588$ crontab -e
no crontab for kevin - using an empty one
Select an editor. To change later, run 'select-editor'.
1. /bin/ed
2. /bin/nano <---- easiest
3. /usr/bin/emacs23
4. /usr/bin/vim.basic
5. /usr/bin/vim.tiny
Choose 1-5 [2]: 5
crontab: installing new crontab
kevin@kevin:/opt/d00148588$ crontab -l
# m h dom mon dow command
00 23 * * * /bin/date > /tmp/datecron.log
kevin@kevin:/opt/d00148588$
删除crontab文件：
kevin@kevin:/opt/d00148588$ crontab -r
kevin@kevin:/opt/d00148588$ crontab -l
no crontab for kevin
kevin@kevin:/opt/d00148588$
2、at使用举例
23:10向/tmp/dateat.log文件中输入系统日期
kevin@kevin:/opt/d00148588$ at 23:10
warning: commands will be executed using /bin/sh
at> date > /tmp/dateat.log
at> <EOT>
job 3 at Thu Sep 13 23:10:00 2012
kevin@kevin:/opt/d00148588$ at -l
3 Thu Sep 13 23:10:00 2012 a kevin
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