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Help: Old Employees Accessing The Linux Server

I've recently noticed that two of my former employees are still accessing one of our Linux box. Old user account wasn't deleted because it has some important files. How do I make sure account get deleted without losing files and email stored in the account? Can you describe a terminations clearance policy for an employee account including email accounts, forwarding aliases, ssh / ftp, and access to vpn dialup services under Red Hat Enterprise Linux server?
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UNIX Create User Account

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?
Answer to “UNIX Create User Account”

By default base directory for the system user is set to /home directory. I'd like to add user to /iscsi/home/${user} directory instead of the default /home. How do I force useradd command to add user to /iscsi/home under CentOS / RHEL / Fedora Linux server?
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Q. I've backup created using rsync command stored at /disk2/home/tom/ directory. Accidentally, I had deleted files from /home/tom directory. I'd like to restore all file names starting with alpha numeric characters from /disk2/home/tom/ to /home/tom. How do I restore selected files in a batch mode?
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Explain Linux / UNIX dot-files

Q. Can you tell me more about dot-files that shell and many UNIX command reads?
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I do not remember where I saved pdf and text files under Linux. I have downloaded files from the Internet a few months ago. How do I find my pdf or text files?
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Understanding /etc/passwd File Format

Can you explain /etc/passwd file format for Linux and UNIX operating systems?
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