Many administrative tasks require to connect to an ssh server without being asked for a password, this can be accomplished with the following step by step instructions:
1) In the client machine create the keys:
ssh-keygen -b 1024 -t rsa
cd ~/.ssh
2) Copy the id_pub.rsa key to the Server machine:
scp id_rsa.pub server:~/.ssh
3) Login into the Server and add [...]

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Every user account in any unix system needs a unique username and a user identifier, known as UID. Every username has a home directory and a login shell. A username could also be member of a group and have a role.
The components of a unix user account are:
Unique username.
Password.
User Identifier (UID), it is [...]

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