How to create a user that doesn't show up on the login screen?

Create system user account -
with UID less than 1000.
Accounts with UID less than 1000 are hidden in gdm and probably others display managers.
You can create system account by running useradd with -r flag.

this solution works for few person i want more details and for different distribution check below reference

Reference:
http://unix.stackexchange.com/questions/64499/how-to-create-a-user-that-doesnt-show-up-on-the-login-screen

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