常用别名

查看近期开机记录

alias lastreboot='last --time-format=iso reboot | tac'

参考来源：Stack Exchange: Command to check if the machine was rebooted

查看默认出口 IP

alias outip="ip route get 8.8.8.8 | head -1 | awk '{print \$7}'"

参考来源：Stack Overflow: How to get the primary IP address of the local machine on Linux and OS X?

查看命令速查表

cht() { curl "http://cheat.sh/$*" } # cheat sheet

IP 地址归属地查询

ipl() { curl -s "http://ip-api.com/json/$1?lang=zh-CN" | jq } # ip to location

随机生成指定长度的字母数字组合

ran() { openssl rand -base64 $(($1*2)) | tr -d '\n=+/' | grep -oP "^[a-zA-Z0-9]{$1}" } # random alphanumeric