cdos
web
linux
- search
- user
  - useradd usermod
  - passwd
  - groupadd groupmod
  - groupdel
  - who
  - w
  - shadow
  - userdel -r 用户名
  - id 用户名
  - groupdel
- compress
  - tar.gz
  - zip
- file 777
  - file
  - standard input ouput
- network
  - write
  - wall
  - mail
  - lastlog
  - traceroute
  - netstat -nltp
- vim
  - basic
- 统计文件大小和系统文件大小
- wc -l 统计结果条数
- shell
- process top
- crontab
- ffpmeg

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sql语句优化－－－

not in !=等等

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