使用任务计划实现系统管理自动化

24cronOpenLinuxcronat24.1croncroncrondLinux/etc/rc.d/init.dcron.initLinuxcroncrond/etccrontabcronloop/etc/cron.d/etc/cron.dMonthlyWeeklyDailyHourlyshellshell/etc/cron.dlibDaily50update-locatedb/etc/cron.d/libupdate-locatedbshell/etc/crontabDailylocateupdatedblocate4cron/var/spool/croncrontab/usr/bincrontabcronlocatedb550cron24.1.1cron/etc/crontabOpenLinuxcroncrontab/var/spool/croncron/etc/cron.allow/etc/cron.deny/etc/cron.allowcronOpenLinuxcroncrontabcrontab-u(su)crontab-ucrontabOpenLinuxcron24.1.2crontabcrontabcrontab#man5crontabcrontabminuteshourdayofmonthmonthdayofweekcommand/etc/crontabdayofweekcommandcrontabOpenLinuxOpenLinux382/etc/crontabOpenLinuxcrontabhwclock*****root/sbin/hwclock--hctosyswhatismakewhatis302***root/usr/sbin/makewhatisOpenLinux15-ecrontab0153045****/usr/local/bin/saytime%crontab-eOpenLinuxvim18picocronsaytimesaytimehttp//metalab.unc.edu/pub/Linux/apps/sound/speech/saytime.tgz*****/usr/local/bin/saytime%%*22**1-4/usr/bin/wall'Timeforbed!Finishedyourhomeworkyet?'%01***/usr/bin/find/-xdev-namecore-exec/bin/rm{}\;%0,30***/user/bin/tputbel/dev/console%*122512*/bin/echo'HappyHolidays'|/bin/mail-sGreetingsroot%wall22241-4/etc/crontabfindcore030tputcrontab18crontabOpenLinux24383384OpenLinuxcron24.2atruncron18atLinuxatatatCPUCPUatatcroncronLinux/etc/crontab...#Runanyatjobseveryminute*****root[-x/usr/sbin/atrun]&&/usr/sbin/atrun...atcroncronatrun/usr/sbinatrun/var/spool/atjobs2:3014:46atatatCtrl+DatatjobsatqatjobsbatchatatatOpenLinuxatatrun-lbatch18at1.5batchatrunbatch/proc/loadavg#cat/proc/loadavg0.200.110.032/50122851015uptime#uptime7:40pmup2:44,3users,loadaverage:0.13,0.08,0.02batch/etc/crontabatrun-l1.5atOpenLinuxatat/etcat.denyat.denyatOpenLinuxatat/etc/at.denyat/etcat.allow/etcat.denyat/etcat.allowat.allowat.deny/etcatatatqatatatrmOpenLinux2438524.324.4crontablynxdumpmaillynxhttp//some.newsource.com/news.html-dump||mail-snewsroot24.51.crontabOpenLinux2.386CD-ROMCalderaOpenLinux2.2CalderaFTPCD-ROM•KDE1.1•WordPerfect8•NetscapeCommunicator4.51•LIZARDCD-ROM•PartitionMagicCalderaEdition•BootMagicCalderaEditionCalderaOpenLinux2.2•StarOffice5.0•BRU