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Linux常用命令-71：who
source link: https://xugaoxiang.com/2022/06/23/linux-cmds-71-who/
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who 命令用来打印当前登录用户的信息，包含了系统的启动时间、活动进程、使用者 ID、使用终端等信息，是系统管理员了解系统运行状态的常用命令。
语法格式： who [参数] [选项]
常用参数：
# 显示用户登录信息
who
# 显示系统最近启动时间
who -bRecommend
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