Linux User management commands (version 2)

Linux User management commands (version 2)
Add User

1. useradd-set Option username [-D view default parameters]

Option:

U: UID (which must not be in the system]

G: Default User Group GID [preferably]

G: specify multiple groups to which the user belongs. You can specify the department to which the user belongs]

D: Specifies the home directory]

S: Command Interpreter Shell [must be included in the/etc/shells file]

C: Description (which can be used to describe who the user is and what permissions the user has]

E: Specifies the user expiration time.

E. g.

Useradd-u 6666-g root-G sys, apache-d/project-s/bin/bash-c "Project manege"-e 2014-2-23 jack

2. Set Password: passwd jack

Delete a user

Userdel [user name] # delete a user. However, the user's home directory is retained.

Userdel-r [user name] # Delete the user's home directory

Add Group

Groupadd webadmin

Or: groupadd-g 8888 webadmin # specify GID = 8888

Save group information in the/etc/group file]

Add User to group and group management commands

To add users to a group: if a file needs to grant special permissions to several users, add these users to the group.

Method 1,

Usermod-G [group name] [user name]

Method 2: [set the group password and members in the management group using gpasswd] <喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD48cD4JZ3Bhc3N3ZCAJLWEgW9PDu6fD + 10gW9fpw/5E/zb71_vcd48dgfiber gugy2vsbhbhzgrpbmc9 "0" cellspacing = "0">

-D. delete a user from the user group.

-A sets the user group administrator. This user can directly participate in the management of this group.

-R: delete user group password

-R: Prohibit users from switching to this group, for example, gpasswd-R webadmin.

Set a password for the group: gpasswd [groupname]

Save the group password in the/etc/gshadow file]

Switch the current user to the group

Switch the current user to a new group: newgrp

Enter the password :*****

View Current Account Information: id

View the group to which the current user belongs: groups

Description: authorizes jack and mary to write the directory/software.

Resolution: Authorize the directory to the user group, and then add users to the group, which is equivalent to authorizing these users

1. Create a directory: mkdir/software

2. Add group: groupadd softadm

3. Add a user to the group: usermod-G softadm jack

Gpasswd-a mary softadm

4. Change the directory group: chgrp softadm/software

5. Change the directory group permission: chmod g + w/software

6. view the directory information: ls-ld/software