#user administration

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to add a new user with a home directory and a group

$ useradd -m -g group user

the group must already exist. you can create a group

$ groupadd group

if the user already exists and you want to add them to a group

usermod -a -G group user

sometimes user accounts will be setup to expire or have a password expiry by default. you can check a user's account/password expiry

$ chage -l user Last password change : Jun 14, 2015 Password expires : Jul 14, 2015 Password inactive : never Account expires : Dec 14, 2015 Minimum number of days between password change : 30 Maximum number of days between password change : 30 Number of days of warning before password expires : 7

if you want to create a system user or a user whose account/password will not expire

$ chage -M -1 user $ chage -I -1 user $ chage -E -1 user $ chage -l user Last password change : Jun 14, 2015 Password expires : never Password inactive : never Account expires : never Minimum number of days between password change : 0 Maximum number of days between password change : 99999 Number of days of warning before password expires : 7

if you want to give a user elevated permissions

$ visudo

add this line somewhere near the bottom of the file

user ALL=(ALL) NOPASSWD: ALL

this will allow you to execute commands with sudo at the front. but remember, some commands might not always be in your user's PATH, so you have to specify the full path to the command. for instance as root, i could do this:

$ service httpd start

but if the 'service' command is not in your user's PATH, you'll have to do it like this: