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Restore Selected Files From Secondary Backup Hard Disk

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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Find Files By Access, Modification Date / Time Under Linux or UNIX

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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