下面是对crontab格式的解释。

# 1. Entry: Minute when the process will be started [0-60]
# 2. Entry: Hour when the process will be started [0-23]
# 3. Entry: Day of the month when the process will be started [1-28/29/30/31]
# 4. Entry: Month of the year when the process will be started [1-12]
# 5. Entry: Weekday when the process will be started [0-6] [0 is Sunday]
#
# all x min = */x

所以根据这个，你的5 8 * * 0会在每周日8:05运行。

@每周工作对我更好! 例如，添加crontab -e，它将在每个周日0:00 AM工作 @weekly /root/fd/databasebackup/week.sh >> ~/test.txt

* * * * 0 

you can use above cron job to run on every week on sunday, but in addition on what time you want to run this job for that you can follow below concept :

* * * * *  Command_to_execute
- � � � -
| | | | |
| | | | +�� Day of week (0�6) (Sunday=0) or Sun, Mon, Tue,...
| | | +���- Month (1�12) or Jan, Feb,...
| | +����-� Day of month (1�31)
| +������� Hour (0�23)
+��������- Minute (0�59)

我想你会喜欢这个交互式网站，它经常帮助我构建复杂的Crontab指令:https://crontab.guru/

下面是对crontab格式的解释。

# 1. Entry: Minute when the process will be started [0-60]
# 2. Entry: Hour when the process will be started [0-23]
# 3. Entry: Day of the month when the process will be started [1-28/29/30/31]
# 4. Entry: Month of the year when the process will be started [1-12]
# 5. Entry: Weekday when the process will be started [0-6] [0 is Sunday]
#
# all x min = */x

所以根据这个，你的5 8 * * 0会在每周日8:05运行。

以人类可读的方式使用crontab构建器的Cron作业表达式