[wuqinfei@wuqinfei ~]$ id uid=500(wuqinfei) gid=500(wuqinfei) groups=500(wuqinfei) context=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
[root@wuqinfei ~]# less /etc/passwd gopher:x:13:30:gopher:/var/gopher:/sbin/nologin ftp:x:14:50:FTP User:/var/ftp:/sbin/nologin nobody:x:99:99:Nobody:/:/sbin/nologin dbus:x:81:81:System message bus:/:/sbin/nologin usbmuxd:x:113:113:usbmuxd user:/:/sbin/nologin avahi-autoipd:x:170:170:Avahi IPv4LL Stack:/var/lib/avahi-autoipd:/sbin/nologin vcsa:x:69:69:virtual console memory owner:/dev:/sbin/nologin rpc:x:32:32:Rpcbind Daemon:/var/cache/rpcbind:/sbin/nologin rtkit:x:499:497:RealtimeKit:/proc:/sbin/nologin ntp:x:38:38::/etc/ntp:/sbin/nologin apache:x:48:48:Apache:/var/www:/sbin/nologin saslauth:x:498:76:"Saslauthd user":/var/empty/saslauth:/sbin/nologin postfix:x:89:89::/var/spool/postfix:/sbin/nologin avahi:x:70:70:Avahi mDNS/DNS-SD Stack:/var/run/avahi-daemon:/sbin/nologin haldaemon:x:68:68:HAL daemon:/:/sbin/nologin pulse:x:497:496:PulseAudio System Daemon:/var/run/pulse:/sbin/nologin gdm:x:42:42::/var/lib/gdm:/sbin/nologin rpcuser:x:29:29:RPC Service User:/var/lib/nfs:/sbin/nologin nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin abrt:x:173:173::/etc/abrt:/sbin/nologin sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin tcpdump:x:72:72::/:/sbin/nologin wuqinfei:x:500:500:wuqinfei:/home/wuqinfei:/bin/bash
[root@wuqinfei ~]# less /etc/shadow ftp:*:15513:0:99999:7::: nobody:*:15513:0:99999:7::: dbus:!!:16023:::::: usbmuxd:!!:16023:::::: avahi-autoipd:!!:16023:::::: vcsa:!!:16023:::::: rpc:!!:16023:0:99999:7::: rtkit:!!:16023:::::: ntp:!!:16023:::::: apache:!!:16023:::::: saslauth:!!:16023:::::: postfix:!!:16023:::::: avahi:!!:16023:::::: haldaemon:!!:16023:::::: pulse:!!:16023:::::: gdm:!!:16023:::::: rpcuser:!!:16023:::::: nfsnobody:!!:16023:::::: abrt:!!:16023:::::: sshd:!!:16023:::::: tcpdump:!!:16023:::::: wuqinfei:$6$NNTEQcmf79DyZKoM$CWVft8dkR1/rGZXUAjUaKO6hsJGulg1ZgGlAQFp73azTYccHDfJDK0zGoivi7PJd4EcsDOV18115PaHlS.9kV/:16023:0:99999:7:::
[root@wuqinfei ~]# less /etc/group dbus:x:81: usbmuxd:x:113: utmp:x:22: utempter:x:35: desktop_admin_r:x:499: desktop_user_r:x:498: avahi-autoipd:x:170: floppy:x:19: vcsa:x:69: rpc:x:32: rtkit:x:497: cdrom:x:11: tape:x:33: dialout:x:18: ntp:x:38: apache:x:48: saslauth:x:76: postdrop:x:90: postfix:x:89: avahi:x:70: haldaemon:x:68:haldaemon pulse:x:496: pulse-access:x:495:
[root@wuqinfei ~]# whoami root
[root@wuqinfei ~]# who wuqinfei pts/0 2014-01-20 22:10 (192.168.1.100)
[root@wuqinfei ~]# w 22:50:17 up 1:14, 1 user, load average: 0.07, 0.02, 0.00 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT wuqinfei pts/0 192.168.1.100 22:10 0.00s 0.52s 0.52s sshd: wuqinfei
[root@wuqinfei ~]# useradd user_a [root@wuqinfei ~]# tail -5 /etc/passwd abrt:x:173:173::/etc/abrt:/sbin/nologin sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin tcpdump:x:72:72::/:/sbin/nologin wuqinfei:x:500:500:wuqinfei:/home/wuqinfei:/bin/bash user_a:x:501:501::/home/user_a:/bin/bash
[root@wuqinfei ~]# tail -1 /etc/shadow user_a:!!:16090:0:99999:7::: [root@wuqinfei ~]# passwd user_a Changing password for user user_a. New password: BAD PASSWORD: it is too simplistic/systematic BAD PASSWORD: is too simple Retype new password: passwd: all authentication tokens updated successfully. [root@wuqinfei ~]# tail -1 /etc/shadow user_a:$6$KGcG8PsU$mdwYuBrhGrspSZWxOyGXbP9yF5rgq2adRDGlTP4eOtRq5RAvMhENDf.dzVYJpAlHarlppSTvvXA4G0aRbm7pT/:16090:0:99999:7:::
[root@wuqinfei ~]# ls /home user_a wuqinfei
[root@wuqinfei ~]# ls -a /etc/skel/ . .. .bash_logout .bash_profile .bashrc .gnome2 .mozilla [root@wuqinfei ~]# ls -a /home/user_a/ . .. .bash_logout .bash_profile .bashrc .gnome2 .mozilla
[root@wuqinfei ~]# tail -3 /etc/group slocate:x:21: wuqinfei:x:500: user_a:x:501:
[root@wuqinfei ~]# useradd -u 600 -G user_a user_b [root@wuqinfei ~]# id user_b uid=600(user_b) gid=600(user_b) groups=600(user_b),501(user_a) [root@wuqinfei ~]#
[root@wuqinfei ~]# userdel user_b [root@wuqinfei ~]# ls /home user_a user_b wuqinfei [root@wuqinfei ~]# userdel -r user_a [root@wuqinfei ~]# ls /home user_b wuqinfei [root@wuqinfei ~]# rm -r /home/user_b rm: descend into directory `/home/user_b'? y rm: descend into directory `/home/user_b/.mozilla'? y rm: remove directory `/home/user_b/.mozilla/plugins'? y rm: remove directory `/home/user_b/.mozilla/extensions'? y rm: remove directory `/home/user_b/.mozilla'? y rm: remove directory `/home/user_b/.gnome2'? y rm: remove regular file `/home/user_b/.bash_logout'? y rm: remove regular file `/home/user_b/.bashrc'? y rm: remove regular file `/home/user_b/.bash_profile'? y rm: remove directory `/home/user_b'? y