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系统版本
root@iZwz95fduas67hq9jscabjZ:~# cat /etc/issue
Ubuntu 20.04.3 LTS \n \l
root@iZwz95fduas67hq9jscabjZ:~# lsb_release -a
LSB Version: core-11.1.0ubuntu2-noarch:security-11.1.0ubuntu2-noarch
Distributor ID: Ubuntu
Description: Ubuntu 20.04.3 LTS
Release: 20.04
Codename: focal
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