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landing/docs/Commands/users/usermod.md

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+# The `usermod` command
+
+The `usermod` command lets you change the properties of a user in Linux through the command line. After creating a user we sometimes have to change their attributes, like their password or login directory etc. So in order to do that we use the `usermod` command.
+
+### Syntax:
+
+```
+usermod [options] USER
+```
+
+#### Note : Only superuser (root) is allowed to execute `usermod` command 
+
+### Options and their Functionalities:
+
+|**Option**   |**Description**   |
+|:---|:---|
+|`-a`|to add anyone of the group to a secondary group|
+|`-c`|to add comment field for the useraccount|
+|`-d`|to modify the directory for any existing user account|
+|`-g`|change the primary group for a User|
+|`-G`|to add supplementary groups|
+|`-l`|to change existing user login name|
+|`-L`|to lock system user account|
+|`-m`|to move the contents of the home directory from existing home dir to new dir|
+|`-p`|to create an un-encrypted password|
+|`-s`|to create a specified shell for new accounts|
+|`-u`|to assigned UID for the user account|
+|`-U`|to unlock any locked user|
+
+### Examples:
+
+1. To add a comment/description for a user:
+```
+sudo usermod -c "This is test user" test_user
+```
+
+2. To change the home directory of a user:
+```
+sudo usermod -d /home/sam test_user
+```
+
+3. To change the expiry date of a user: 
+```
+sudo usermod -e 2021-10-05 test_user
+```
+
+4. To change the group of a user: 
+```
+sudo usermod -g sam test_user
+```
+
+5. To change user login name:
+``` 
+sudo usermod -l test_account test_user
+```
+
+6. To lock a user:
+```
+sudo usermod -L test_user
+```
+
+7. To unlock a user:
+```
+sudo usermod -U test_user
+```
+
+8. To set an unencrypted password for the user:
+```
+sudo usermod -p test_password test_user
+```
+
+9. To create a shell for the user:
+```
+sudo usermod -s /bin/sh test_user
+```
+
+10. To change the user id of a user:
+``` 
+sudo usermod -u 1234 test_user
+```