Linux User Management (2)----Modify user mode (Usermod,sudo permissions, etc.)

Modifying the consumer mode can be accomplished using the USERMOD command.

First, usermod commonly used command introduction:

-A: Use only with-G to add users to the affiliate group.

-D: Modify the user login directory, such as the normal user login, the default into the pre-set home directory, some times in order to facilitate the login need to enter a more complex path, you can use this option to set the entry-time directory.

-G: Modifies the group to which the user belongs.

-G: Modify the additional group to which the user belongs, and use this option when changing the user's sudo permissions.

-S: Modify the shell version used by the user after login

Two, sudo permissions

Users get sudo permissions and can use two ways

1. Modify the/etc/sudoers file to add the user name to the sudo permission group, for example

2. The second option is to modify the user's affiliate group:

Can be modified using USERMOD or GPASSWD

(1) Modify with Usermod

$ sudo usermod-a-g sudo tt

After the modified results can be viewed/etc/group, you can see that the sudo column contains the TT

Files that may be involved:

FILES
/etc/group
Group account information.


/etc/gshadow
Secure group account information.


/etc/passwd
User account information.


/etc/shadow
Secure user account information.

(2) using GPASSWD

Common commands:

-A: Adding users to the specified group

-D: Remove the user from the specified group

Other options:

-M sets the group member list

-A sets the list of administrators for the group

For example:

Add TT to the sudo group member:

sudo gpasswd-a tt sudo

Remove the TT from the sudo group:

sudo gpasswd-d tt sudo

Third, to solve every use of sudo need to enter a password, too much trouble.

Workaround:

Modify the/etc/sudoers file

Linux User Management (2)----Modify user mode (Usermod,sudo permissions, etc.)