Account management commands and files in Linux

 

Command:

# Useradd Sunday --> Add a user

Useradd-u 720-g 100-M-s/bin/bash Sunday

-M does not create a root directory.

-D: Specify the root directory.

-S shell

# Passwd Sunday --> Add a password for the user

# Usermod-L Sunday --> lock account

# Usermod-U Sunday ---> unlock an account

# Usermod-e 2008-08-08 Sunday --> set the Account expiration time

# Groupadd debian --> Add a group account

# Useradd-g debian Sunday --> specify the group to which the user belongs

# Usermod-g debian Sunday --> modify a user's group

# Groupdel debian --> delete a group

File:

/Etc/shadow

Username: encrypted password (if * indicates that the account cannot be logged in): Last modification time (days from January 1, January 1, 1970): minimum number of days for the password to be modified: number of days before password modification warning to users: Number of days after password termination when the account is disabled: Number of days since January 1, January 1, 1970: reserved domain

Drobbins: $1 $1234567890123456789012345678901: 11664: 0:-1:-1:-1:-1:0

/Etc/passwd

Username: password: User ID: Group ID: comment: home directory: shell

Command executed after the user logs on

/Etc/group

Groupname: x (indicates that the group lease password is in/etc/shadow): GID: usernames

Root: x: 0: root, Sunday, onlyisi