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October 22, August 6 2015dnsdomainname-> hostname Lrwxrwxrwx.1rootroot8 October 22, August 6 2015domainname-> hostname Lrwxrwxrwx.1rootroot2 August 6 2015ex-> vi Lrwxrwxrwx.1rootroot3 August 6 2015gtar-> tar Lrwxrwxrwx.1rootroot41 August 6 2015iptables-xml->/etc/alternatives/bin-iptables-xml.x86_64 Lrwxrwxrwx.1rootroot2 February 22, August 6 2015iptables-xml-1.4.7->/sbin/iptables-multi Lrwxrwxrwx.1rootroot22 August 22, August 6> 5mail->/etc/alternati

Function Functional programming The most important thing is to enhance the reusability and readability of code Define and use def function name (parameter):...function body...return valueThe definition of a function has the following main points:def: A keyword that represents a functionFunction name: the names of functions, which are called later by function nameFunction Body: A series of logical computations in a functionParameters: Providing data for the function bodyReturn

-* *5Mail All_members //55 points a week to remind all team members to send weekly system-level crontab system-level crontab only the root permission is authorized to edit, the crontab is a file, the location is/etc/crontab, the syntax for system-level crontab is slightly different from the above, requiring that command performers be added between frequencies and commands, as shown below, and that you can add some global variables to use in scheduli

example to explain the configuration file format.? 1234567891011121314151617181920212223242526272829303132333435363738394041 # sample logrotate configuration filecompress # 全局配置项，对切分后的文件做gzip压缩# 一个配置文件中可以包含多个相互独立的sections# 其中，待切分文件路径 + { xxx }构成了一个独立的section，每个section可以配置针对该类文件的切分行为# 注意：全局配置项会作用于每个section，除非在该section配置中覆盖了全局配置项的行为 # 下面section的配置表明按时间间隔（weekly）触发日志的自动切分，历史数据只保存最近的5份# 切分完成后，通过发送-HUP信号来重启syslogd这个daemon进程。/var/log/messages { rotate 5 weeklypostrotate/sbin/killall

. Log {Rotate 5Mail www@my.orgSize 100 KSharedscriptsPostrotate/Sbin/killall-hup httpdEndscript}/Var/log/news /*{MonthlyRotate 2Olddir/var/log/news/oldMissingokPostrotateKill-HUP 'cat/var/run/Inn. Pi'EndscriptNocompress}-- --@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@Super daemonChkconfig -- list | grep xinetdDaemon can be divided:Stand alone -- refers to services that are not in the xinet.Super daemon -- refers to the services in Xinetd.Super daemon is e

once per minute* * * * * Date >>/home/mydatetestHere's a complicated notation.Edit the scheduled task under root crontab-U Root-e appends a string to a text at 6 o ' Day in the morning. 0 6* * * echo"Good morning.">>/tmp/Test.txt appends a string to a text every two hours. 0*/2* * * echo"There is a break now .">>/tmp/test.txt 11 o'clock to 8 a.m., every two hours, eight a.m. .0 at-7/2，8* * * echo"a good dream:)">>/tmp/Test.txt, 4th per month and Monday to Sunday, three a.m. 11 .0 One 4*1-3Com

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