Linux是多用戶操作系統，支持多用戶同時在線，支持對登陸用戶的管理：查看與剔除等。

一、查看在線用戶命令

命令： w

二、查看登錄記錄命令?

命令 last

三、剔除在線用戶命令

命令：sudo pkill -kill -t usr

四、pkill用法

Usage:pkill [options] <pattern> Options: -<sig>, --signal <sig>????signal to send (either number or name) -e, --echo????????????????display what is killed -c, --count???????????????count of matching processes -f, --full????????????????use full process name to match -g, --pgroup <id,...>?????match listed process group IDs -G, --group <gid,...>?????match real group IDs -n, --newest??????????????select most recently started -o, --oldest??????????????select least recently started -P, --parent <ppid,...>???match only child processes of the given parent -s, --session <sid,...>???match session IDs -t, --terminal <tty,...>??match by controlling terminal -u, --euid <id,...>???????match by effective IDs -U, --uid <id,...>????????match by real IDs -x, --exact???????????????match exactly with the command name -F, --pidfile <file>??????read PIDs from file -L, --logpidfile??????????fail if PID file is not locked --ns <pid>????????????????match the processes that belong to the samenamespace as <pid> --nslist <ns,...>?????????list which namespaces will be considered forthe --ns option.Available namespaces: ipc, mnt, net, pid, user, uts-h, --help?????display this help and exit-V, --version??output version information and exit

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總結

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