Linux User and group management __linux

Centos:

-------------------------------------------------------#创建用户 (default create group with same name) Useradd myuser1 adduser-g MySQL myuser2 adduser-d/home/myuser3-p 123456 myuser3 adduser-g root-g mysql,postgres myuser4 #设置用户密码 passwd myuser4 #查看用户信息 (Myus Er3 password is plaintext; myuser4 password is ciphertext) Cat/etc/shadow cat/etc/passwd #查看用户uid及属组gid ID root ID 1000 #更改用户模式 (options similar to creation) Usermod-l Myuse
R1 usermod-g Root Myuser2 #添加当前用户到其他组 usermod-a-G mysql,postgres myuser3 #切换用户 su myuser4 su-myuser4 #查看当前所有连接用户 W, who, users #查看当前登录用户 WhoAmI, Id-un, who am I, who mom likes, #查看某用户登录历史 (such as root) last root #剔除某用户连接 ps-ef|
grep pts/? kill-9 pid #删除用户 userdel myuser1 userdel-r myuser2-------------------------------------------------------#创建组 Group Add MyGroup #查看组 Cat/etc/group | Cut-d ': '-f1 #更改组名 (MyGroup to Kkgroup) groupmod-n Kkgroup #给用户 (such as root) add other groups MyGroup Kkgroup-G usermod-a ro OT #查看组中所有用户 groups Kkgroup #同步信息: from/etc/passwd to/etc/shadow pwconv #同步信息: from/etc/group to/etc/gshadow Grpconv #删除组 Gro UPdel Kkgroup-------------------------------------------------------