User administration

User administration

1 Addin user

2 Modifying/Deleting User Accounts

3 Deleting user

4 Password Aging Policies

5 Adding Group

6 Modifying Group

7 Deleting Group

USER

Addin user                          #useradd tawheed                    [useradd option user_name]

                                    #cat /etc/passwd                    [check user]

Change user home dir                #usermod -d /idb tawheed            [usermod -d /home_dir user_name]

change user shell                   #usermod -s /bin/nologin tawheed    [usermod -s shell_path user_name]

                                    #chsh -s /sbin/nologin tawheed      [chsh -s shell_path user_name]

                                    #chsh -l

change user user id                 #usermod -u 509 tawheed             [usermod -u id user_name]

                                    #id tawheed                         [id user_name]

change user primary/login group     #usermod -g root tawheed            [usermod -g group_name user_name]

                                    #less /etc/group                    [check user group]

                                    #tail -n 5 /etc/group

                                    #grep sales marketing /etc/group

change user secondary group         #usermod -G sales tawheed           [usermod -G group_name user_name]

lock the password/user lock         #usermod -L tawheed                 [usermod -L user_name]

Unlock passwork or user unlock      #usermod -U tawheed                 [usermod -U username]

expire user & disable with          #usermod -e 2009-10-15 tawheed      [usermod -e expire date user_name]

Remove user expiration              #usermod -e never tawheed           [usermod -e never user_name]

Deleting user with home directory   #userdel -r tawheed                 [userdel -r user_name]

Change comment                      #userdel -c "tawheed musabbir" tawheed

PASSWORD AGE

list the password aging settings    #chage -l tawheed                   [chage -l user_name]

expire account on the date          #chage -E 2009-12-15 tawheed        [chage -E date user_name]

remove expiretion for user          #chage -E -1 tawheed                [chage -E -1 username]

                                    #chage -E never tawheed

Minimum time, cant change password  #chage -m 2009-10-15 tawheed        [chage -m date username]

Maximum timeve to change password   #chage -M 2009-12-31 tawheed        [chage -M date user_name]

Inactive passward after expire      #chage -I 2009-5-12 tawheed