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* * * * * /bin/date >>/tmp/date.txt?* * * * * sleep 10; /bin/date >>/tmp/date.txt?
string????????????meaning??
------???????????-------??
@reboot????????Run?once,?at?startup.??
@yearly?????????Run?once?a?year,??"?0?0?1?1?*?".??
@annually??????(same?as??@yearly)??
@monthly???????Run?once?a?month,??"?0?0?1?*?*?".??
@weekly????????Run?once?a?week,??"?0?0?*?*?0?".??
@daily???????????Run?once?a?day,??"?0?0?*?*?*?".??
@midnight??????(same?as??@daily)??
@hourly?????????Run?once?an?hour,??"?0?*?*?*?*?”.?
root@iZ94hgp4s2xZ:~# w??10:15:27 up 1 day, 19:20, ?2 users, ?load average: 0.00, 0.01, 0.05?USER ? ? TTY ? ? ?FROM ? ? ? ? ? ? LOGIN@ ? IDLE ? JCPU ? PCPU WHAT?jediael ?pts/0 ? ?218.107.55.252 ? 09:15 ? 31.00s ?0.13s ?0.13s -bash?root ? ? pts/1 ? ?218.107.55.252 ? 10:15 ? ?1.00s ?0.02s ?0.00s w?root@iZ94hgp4s2xZ:~# pkill -kill -t pts/0?
cat /etc/passwd | cut -d ‘:‘ -f 1?apt-cache dumpavail | grep ?‘Package: mysql’?cat /etc/passwd | sort -t ‘:‘ -k 3 -n?last | cut -d ‘ ‘ -f 1 | sort | uniq -c?
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原文地址：http://www.cnblogs.com/jinhong-lu/p/4634844.html
