主題: 任務排程:at,batch,cron,anacron,

[小徒兒]

在crontab 最好使用path
#!/bin/bash

PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH

代碼: [選擇]


at
at 4am
at 6pm
at 16
at 16:00
at 5pm + 4days
at 4 tomorrow
at -f commandfile 19
at 19 < command file
echo "mail -s report < rep.txt boss" | at now +2min

at -l #show all at jobs = atq
at -d 93 #delete #93 job = atrm 93



first match rule for at & cron

代碼: [選擇]


at 　　　　　| 　　　cron
----------------------------------------
/etc/at.allow 　　/etc/cron.allow
/etc/at.deny　　/etc/cron.deny

-----------------------------------------
default: deny | default: allow


if there is no /etc/cron.allow, /etc/cron.deny, then every user is allowed by default.
if there is no /etc/at.allow,/etc/at.deny, then every user is denied by default.

if you want to enable user to use at command, just #touch /etc/at.deny.
because there is no body name in the deny list, then every body is allowed to use at.

[小徒兒]

$crontab -l 等於cat /var/spool/cron
$crontab -e
$crontab -r

#cron -u sysop #you can see other's cron

# vi /etc/crontab
# vi /etc/cron.d

[分 時 日 月 周] [user] [cmd]

02 4 * * * root run-parts /etc/cron.daily

[小徒兒]

/etc/anacrontab

run not in the fixed date, but by the minimal time in a fix period of time

1       65      cron.daily              run-parts /etc/cron.daily

[period] [delay min] [the anacron name] [command]

[小徒兒]

$batch
echo workload is low enough
<ctrl-d>

batch run when the system load is low enough.

[唐小路]

對不起～上一篇按錯了，麻煩版主大人幫我刪掉，謝謝，抱歉抱歉！

$crontab -l 等於cat /var/spool/cron

我覺得這個地方應該是要cat /var/spool/cron/$USER 比較好說
因為cron是個目錄，底下的$USER才是各個user的排程。