DAY 11 - USERADD | USERDEL

q  useradd [Entry files]
 
v  /etc/passwd
v  /etc/shadow
v  /etc/group
v  /etc/gshadow
v  /etc/shells
v  /etc/default/useradd
v  /etc/skel [Automatically created file for user’s home like.bashProfile,.bashrc,.bashHistory]
v  /var/spool/mail/<username>
v  /etc/login.defs

r  User's Types:
 
v  root user: Administrator (#)
v  system user: service (mail/ftp/ssh/daemons)-cannot login
v  regular user: student, guest, shohan ($)

q  useradd shohan
 
v  Login Name: shohan
v  UID:

Ü  super user:  root  : UID : 0  ||  P-GID : 0
Ü  system/service user: UID : 1-499 [RHL6], 1-999[RHL7]  ||  P-GID : 1-999
Ü  regular user: UID : 1000 ||  P-GID : 1000

v  GID
v  User’s Details [FirstName & LastName]
v  Password
v  Home-Directory
v  Shell

q  useradd [options] LOGIN-username
 
v  useradd <username>
v  useradd -d <Home_directory> <username>
v  useradd -c <Comments> <username>
v  useradd -s <Shell> <username>
v  useradd -u <UID-user ID> <username>
v  useradd -g <Primary-GID> <username>
v  useradd -g <Primary-GroupName> <username>
v  useradd -G <Secondary-GID> <username>
v  useradd -G <Secondary-GroupName> <username>
v  useradd -N <Create user without group> <username>
 
o   useradd –u 1010 –g family –G cisco –s /bin/bash –c “Shohanur Rahaman” –d “/home/shohan” shohan
 
o   id shohan [To check weather this user available in the system]

q  userdel [options] LOGIN-username
 
v  userdel <username> [Delete user without deleting Home Directory + Mail Spool]
v  userdel -rf shohan
 
    ·        -f --force [force actions removal of user still logged in]
    ·        -r --remove [remove home directory and mail spool]