小功能

解析域名得到ip

ping www.baidu.com -c 1 | sed '1{s/[^(]*(//;s/).*//;q}'

查看系统信息

[root@jysp ~]# uname -a
Linux jysp 4.18.0-193.28.1.el7.aarch64 #1 SMP Wed Oct 21 16:25:35 UTC 2020 aarch64 aarch64 aarch64 GNU/Linux

[root@jysp ~]# cat /proc/version
Linux version 4.18.0-193.28.1.el7.aarch64 (mockbuild@aarch64-01.bsys.centos.org) (gcc version 8.3.1 20190311 (Red Hat 8.3.1-3) (GCC)) #1 SMP Wed Oct 21 16:25:35 UTC 2020

[root@jysp ~]# cat /etc/redhat-release
CentOS Linux release 7.9.2009 (AltArch)

[root@jysp ~]# arch
x86_64