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root root

When I ssh into my server and login as t root user and I'm getting the following error on screen:

Could not chdir to home directory /root: No such file or directory

How do I fix this error under CentOS or Debian Linux server?
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Linux Command: List All Users In The System

I'm a new Linux sys admin and I'm unable to find the command to list all users on my RHEL server. What is the command to list users under Linux operating systems?
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Linux: Show The Groups a User Is In

How do I find out what groups I belong to under Linux operating systems?
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Linux / Unix: Bash Find Matching All Dot Files

A dot-file is generally any file whose name begins with a full stop. In Linux or Unix like operating system it is also called as hidden file. How do I list all dot files in my home directory?
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How do I delete old yum repositories and configuration files under RHEL 5 or CentOS Linux server?
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UNIX / Linux: Explains setuid File Permission

What does it mean for a file to be "setuid?" How do keep track of all setuid enabled file?
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Can you completely explain the nine permissions bits on UNIX or Linux files?
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