Use of Linux usermod command

Use of Linux usermod command

1. Command Introduction

The usermod (user modify) command is a system administrator command used to modify a user account.

usermod can be used to modify various settings of user accounts and modify system account files to reflect changes specified through the command line.

2. Command format

usermod [OPTIONS] LOGIN

3. Option Description

-c, --comment
Add backup information -d, --home HOME_DIR
The user's new home directory -e, --expiredate EXPIRE_DATE
Set the account expiration date -f, --inactive INACTIVE
After INACTIVE days, set the password to invalid state -g, --gid GROUP
Force GROUP to be the new primary group -G, --groups GROUPS
New additional group list GROUPS
-a, --append GROUP
Add the user to the additional groups mentioned in -G above, without removing the user from other groups -h, --help
Display this help message and launch -l, --login LOGIN
new login name -L, --lock
Lock user account -m, --move-home
Move the contents of your home directory to a new location (only used with -d)
-o, --non-unique
Allow duplicate (non-unique) UIDs
-p, --password PASSWORD
Set the encrypted password (PASSWORD) as the new password -s, --shell SHELL
The new login shell for this user account
-u, --uid UID
New UID for the user account
-U, --unlock
Unlock user account -Z, --selinux-user SEUSER
New SELinux user mapping for user accounts

4. Common Examples

(1) Modify the user's home directory.

usermod -d /home/tom tom

(2) Change the user's uid.

usermod -u 888 tom

(3) Change the user name to jerry.

usermod -l jerry tom

(4) Lock the tom user.

usermod -L tom

(5)Unlock the tom user.

usermod -U tom

(6) Add new additional groups.

usermod -G deng tom

(7) Modify the user login shell.

usermod -s /bin/sh tom

(8) Modify the user's GID.

usermod -g 1003 tom

(9) Specify the account expiration date.

usermod -e 2020-12-31 tom

(10) Specify the number of days after the user account password expires before disabling the account.

usermod -f 3 tom

The above is the detailed content of the use of Linux usermod command. For more information about Linux usermod command, please pay attention to other related articles on 123WORDPRESS.COM!

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