UNIX Create User Account

Posted on in Categories last updated April 13, 2010

How do I create a user account under UNIX operating system and assign a password to user account so that he / she can login into server or UNIX workstation?

You need to user the useradd command under UNIX operating systems to create user account and password command to set a password for the same. You need to login as root user to add users. Usually, /etc/passwd, /etc/group and /etc/shadow or /etc/master.passwd files are required for user account management.

Example: Add A User Called Tom Under UNIX

Create / add a user called tom with home directory, enter:
# useradd -m tom

Setup A Password For Tom

Type the following command:
# passwd tom
Make sure password must be 8 character long and include special characters and digits for security.

How Do I Add User Jerry To A Secondary Group Called Sales?

Type the following command:
# useradd -G sales -m jerry
# passwd jerry

How Do I Add /bin/ksh as A Shell While Creating A User Account?

Use the following syntax:

useradd -m -s /bin/ksh username

How Do I Setup HomeDirectory Path While Creating A User Account?

Use the following syntax:

useradd -m -s /bin/ksh -d /path/to/home/user username

You can pass all those options as follows:
# useradd -d /nas/users/v/vivek -m -s /bin/bash -c "Vivek Gite" vivek
# passwd vivek

Further readings:

See useradd and passwd command man page:
man useradd
man passwd

Posted by: Vivek Gite

The author is the creator of nixCraft and a seasoned sysadmin and a trainer for the Linux operating system/Unix shell scripting. He has worked with global clients and in various industries, including IT, education, defense and space research, and the nonprofit sector. Follow him on Twitter, Facebook, Google+.

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