Account Management commands and files in Linux

& Nbsp; command: # useraddsunday -- & gt; add user useradd-u720-g100-M-s/bin/bashsunday-M don't create root directory-d specify root directory-s use shell # passwdsunday -- & gt; add a password for the user # usermod? Lsunday -- & gt; locked account  

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 the 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 --> specifies the group to which the user belongs

# Usermod? G debian Sunday --> modify the group to which the user belongs

# 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