Life is short.
ps - Command Usage
usermod - Command Usage
Linux Creating User Cheat Sheet
passwd - Command Usage
useradd - Command Usage
systemctl - Command Usage
lsb_release - Command Usage
uname - Command Usage
wc - Command Usage
nl - Command Usage
sed - Command Usage
awk - Command Usage
grep - Command Usage

Find My Public IP:

curl icanhazip.com

IPv4:

curl -4 icanhazip.com

IPv6:

curl -6 icanhazip.com

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在新页面中打开

curl - Command Usage