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@@ -108,56 +108,70 @@ sys 0m0.000s #在内核模式中的时间
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#### login 命令
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#### login 命令
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```
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```
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-
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+login nick #当前用户切换到 nick 登录
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```
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```
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#### logout 命令
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#### logout 命令
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```
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```
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-
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+logout #以当前用户退出登录
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```
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```
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#### exit 命令
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#### exit 命令
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```
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```
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-
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+exit #退出登录或登录当前 shell 脚本
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```
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```
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#### clear 命令
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#### clear 命令
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```
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```
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-
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+clear #清除屏幕内容
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```
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```
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#### alias 命令
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#### alias 命令
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```
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```
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-
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+alias gs="git status" #给 git status 起别名为 gs,仅在当前环境生效,关闭终端或退出登录以后无效,一般配置在当前 shell 的配置文件中
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```
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```
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#### unalias 命令
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#### unalias 命令
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```
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```
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-
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+unadlias gs #取消命令别名
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```
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```
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#### type 命令
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#### type 命令
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```
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```
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-
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+type pwd #查看命令的类型
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```
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```
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#### w 命令
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#### w 命令
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```
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```
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+w #查看当前登录系统的用户
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+```
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+
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+#### mesg 命令
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+
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+```
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+mesg y #允许终端接收信息
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+mesg n #禁止终端接收信息
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```
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```
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#### write 命令
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#### write 命令
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```
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```
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+write root #向 `root` 用户发送消息,实时的,用户必须登录服务器状态并且 `mesg` 设置为 `y` 才可以接收到,输入信息之后按 `control +d`
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+```
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+
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+#### wall 命令
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+```
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+wall #向所有在线的用户发送消息,输入信息之后按 `control +d` 发送,`mesg` 设置为 `y` 才可以接收到
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```
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```
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#### sort 命令
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#### sort 命令
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