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ologists and system administrators often need to quickly verify user accounts, manage group memberships, and maintain system integrity. Whether you're troubleshooting user登录问题 or simply want to auditing your系统权限, knowing how to view user and group information on a Linux系统 is essential.

查看用户列表

To display a list of all user accounts on your system, you can use the following命令:

cat /etc/passwd

This command outputs a list of usernames along with their associated user information, such as uid (用户ID), gid (用户组ID), and home directory path.

查看当前活跃的用户列表

If you only want to see currently active user accounts, you can combine the w command with command substitution:

who | head -n $(w | wc -l)

The who command displays信息关于当前登录的用户, while head -n $(w | wc -l) limits the输出到当前活跃用户数量。

查看用户组

要查看用户所属的用户组，可以使用以下命令:

cat /etc/group

This command会显示每个用户组的信息, 包括组ID和组成员的用户名。

总结

通过以上命令,你可以轻松查看和管理用户和用户组信息, 了解系统中用户登录情况, 并进行权限管理.

[注意：本文无总结语句，纯技术性内容呈现]