Useradd
useradd [options] LOGIN
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-R: Create a System user
-U uid: can specify uid;
-G GID: Specifies the base group to which the user belongs, which must exist beforehand
-C: comment some information
-d/path/to/somewhere: Specifies the user's home directory path;
-S shell: Sets the user's default shell;/bin/bash those
-G GID,... : Specifies the additional group to which it belongs;
Groupadd: Creating Groups
Groupadd [OPTIONS] GROUPNAME
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-G GID: indicates the group ID;
-R: Create a system group;
ID: View user-related ID information;
ID [OPTION] ... [USER]
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-u:uid
-g:gid
-g:groups
-n:name
Su:switch User, switching users or executing commands as other users;
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Su USERNAME: non-complete switching, non-login switching
su-username or su-l USERNAME: full switch, login switch
Usermod: User Property modification
usermod [OPTION] ... LOGIN
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-u uid modifies the value of the UID
-G gid modifies the value of GID
-G Gid[,gid,...] : Modify the additional group to which the user belongs
-S Shell, modifying the user Shell location
-C: Modify annotation information
-D home: when the user's home directory is modified to a new location, the user's original file is not moved to the new home;the-M option allows it to be moved to a new home directory at the same time;
note the location of the parameter, and the target directory cannot exist beforehand
-L : Account renaming
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passwd: To add a password to the user, ordinary users can change their own, the administrator can change everyone
passwd [OPTION] [UserName]
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-L: Lock account
-u: unlock
-N mindays: minimum term of use; Unit is day
-x maxdays: Default is 99999 days;
-W warndays: Alarm date, first n days of expiration date
-I inactivedays: Inactive days, expiry can give you really long time to struggle
Userdel: Deleting users
Userdel [-R] USERNAME
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-R: Delete theuser's home directory at the same time;
Groupmod: Group Property Modification
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groupmod [OPTION] GROUPNAME
-N Modify group name
-G Modify GID
gpasswd: Set password for group
NEWGRP: Toggles the base group for the specified group
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Groupdel: Deleting a group
Chage: Modify the properties of user account and password
chage [OPTION] ... LOGIN
-D Specify modified date
-e Specifies the number of days to expire
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August 25 Jobs