Shulou(Shulou.com)06/02 Report--

/ etc/passwd

/ etc/shadow

/ etc/gshadow

/ etc/group

You can view instructions with man 5 passwd/shadow/gshadow/group

Execute two commands simultaneously

Head-2 / etc/passwd; tail-2 / etc/passwd

Groupadd-g 1100 grp1 New Group and definition Group number

Groupdel grp1 delete group (some users in the group cannot delete it)

Useradd test creates users and default groups just like user names

Useradd-M username create users do not create home directories

Useradd-u specifies uid

Useradd-g specifies the group name

Userdel username Delete user

Userdel-r username deletes the user and deletes the home directory

Usermod-u 1022 username modify uid

Usermod-g 1022 goupname modify gid

Usermod-d / home/newhome username

Usermod-s / sbin/nologin username modify user shell

Passwd user modifies user password

Passwd-l user Lock user password usermod-L user

Passwd-u user unlock user password usermod-U user

Passwd-- stidn user modify password console echo password

Echo "11111111" | passwd-- stdin user

Echo "123456\ n123456" | passwd user double quotation marks reserved escape

Random password generation tool

Yum install-y expect

Mkpasswd-l 8-s 0

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