"Linux Rookie 2" System timing delay task

Delay and timing mechanism of the third Unit system

1.at delay

at time

at> Action

At>ctrl +d

at> <EOT>

     

at-l

ATRM task number

when an action is executed with output

The output is sent to the initiator of the task in the form of a message

at user's black and white list

/etc/at.deny # #默认存在并生效

/etc/at.allow # #默认不存在. Once present, the/etc/at.deny fails

# # # #2. Recurring tasks

Command mode initiated:

crontab-u username-e

mm hh dd mm WW

MM/2 # #每隔两分钟

HH1-HH2 # #多少点到多少点

HH1,HH2 # #多少点和多少点

     

     

crontab-l # #查看

crotab-u usename-r # #删除

     

The way the file originated

vim/etc/cron.d/filename

mm hh dd mm WW usename action

     

echo ' mm HH dd mm WW usename action ' >/etc/cron.d/filename

     

Black and white list

/etc/cron.deny

/etc/cron.allow

3. Management of temporary system files

vim/usr/lib/tmpfiles.d/*.conf

type filename permusergrouptime

d/mnt/westos1777rootroot10s

     

     

systemd-tmpfiles--create/usr/lib/tmpfiles.d/*

systemd-tmpfiles--clean/usr/lib/tmpfiles.d/*

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"Linux Rookie 2" System timing delay task