lab6

1) sudo useradd -m <username>  -add user with home directory
2) sudo userdel -r <username>  -delete a user and their home dir 
3) sudo useradd -r <username>  -add system user
4) sudo passwd <username> - change password
5) sudo usermod -aG admins <username> - add user to admins group




lab commands
1) sudo useradd -m <username>  -add user with home directory
2) sudo passwd <username> - change password
3) sudo usermod -c <comment> <username> - change info (comment)
4) sudo usermod -d <new_homedir_name> -m <username> - move home directory of 3rd user to /home/user
5) su <username> - change to other user
6) sudo chsh -s /bin/sh <username> - change shell to /bin/sh 
7) sudo groupadd <groupname> - create a group
   sudo usermod -aG <groupname> <username>
   cat /etc/group - see all available groups
8) chown <user>:<group> <file|folder>
9) chmod [u=rwx | o=rwx | g=rwx] filename|foldername 
10)chmod u=r,o=,g=w testdir