## 執行權限
```
chmod u+x script.sh
```
## 執行日志
```
#/bin/bash
exec &> /root/log/script.log
...
```
## 定期執行
cat /etc/crontab
```
SHELL=/bin/bash
PATH=/sbin:/bin:/usr/sbin:/usr/bin
MAILTO=root
# For details see man 4 crontabs
# Example of job definition:
# .---------------- minute (0 - 59)
# | .------------- hour (0 - 23)
# | | .---------- day of month (1 - 31)
# | | | .------- month (1 - 12) OR jan,feb,mar,apr ...
# | | | | .---- day of week (0 - 6) (Sunday=0 or 7) OR sun,mon,tue,wed,thu,fri,sat
# | | | | |
# * * * * * user-name command to be executed
```
每5分鐘執行一次腳本
```
*/5 * * * * root /root/scripts/backup.sh
```
腳本鎖定執行（確保本次腳本100%執行完畢后，才啟動下一次腳本執行）
```
*/5 * * * * root flock -xn /dev/backup.lock -c "/root/scripts/backup.sh"
```
