seq 输出数字系列

cat 倒叙输出
head -6 /etc/passwd | cat -n |tac
ssh代理登录(参考:https://www.xiebruce.top/650.html)
ssh代理登录从 known_hosts 文件中删除所有属于 hostname 的密钥
ssh-keygen -R 172.30.33.179
➜ netlops@netlopsdeMacBook-Air ~/ ssh-keygen -R 172.30.33.179
# Host 172.30.33.179 found: line 8
# Host 172.30.33.179 found: line 9
# Host 172.30.33.179 found: line 10
/Users/netlops/.ssh/known_hosts updated.
Original contents retained as /Users/netlops/.ssh/known_hosts.old
监听文件小工具:inotifywait和inotifywatch
/bin/bash —rcfile 用法
--rcfile**选项时,Bash shell将读取指定的文件,并将其作为启动文件,rcfile文件通常包含一些Bash shell的配置信息,如环境变量,别名,函数等