User and Group Management Flashcards
cat useradd
Create a new user or update default new user information
- change default home directory
-update users default group
- set expiration date for disablement
groupadd
create a new group
- set group ID different then default one upon creation
-specify group as a system group
usermod
modify a user account
-change users group membership
-change user ID
-update group membership
groupmpod
modify a group definition on the system
-update group ID and name of group
userdel
delet a user account and related files
-r remove files in home directory
groupdel
delete a group
-you cannot remove a group that is a primary group for an existing user, first user must be deleted
passwd
change users password. The super user can change password for any user
- to change your own password type passwd
-to change another users password as a root or superuser type passwd and user name
How do you see a group ID?
cat /etc/group and scroll down to the group you created
What is the command to update a groupID and add a new group
groupadd -g 1200 ops
What is the command to see the ID for a user?
ID clark or whatever username they have
How do you create a new user without a default home directory but instead assign it to a new group you create?
useradd -M -g ops barry (-M will not create a home directory for the user) (-g will create a group)
Command to see list of users
cat /etc/passwd
ll /home/
usermod -G dev, ops -u 1300 clark
this updates clarks groups to dev and ops and their id
groupmod - n dev2 dev
This command modifies the name of dev using -n option and changes it to dev2 to see this change do id clark and notice the group name he is assigned to is no longer dev the ID doesnt change
