Lab Building Race 19 backup log file

The requirements for log backups are described below:
To add a scheduled task to a Shiyanlou user
Pack/var/log dpkg.log,mysql.log,fontconfig.log three files to/home/shiyanlou/backup/directory every day 2 o'clock in the morning
The name format is year-month-day. Tar, for example today is October 23, 2017, then the file name is 2017-10-23.tar, and if there is a duplicate, overwrite

The first step
I searched the internet first. How to use time to name

$ (date +%y-%d-%m). Tar

Step Two
To add a scheduled task to a Shiyanlou user

Step Three
Add a task

0 2 * * * tar-zcf/home/shiyanlou/backup/$ (date +%y-%d-%m). Tar/var/log/dpkg.log/var/log/mysql.log/var/log/fontconfig. Log

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