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Append Current Date To Filename in Bash Shell

How do I append current date (mm_dd_yyyy format) to a filename (e.g., backup_mm_dd_yyyy.sql) under UNIX like operating systems?
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How do I remove all partitions, data and create clean empty hard disk under Linux operating systems?
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Linux: Find Files By Date

How do I find file by date under UNIX and Linux?
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How do I Be More Productive In Vim?

This is a user contributed FAQ.

Q. I'm just starting in vim text editor but I'm annoying typing and retyping similar statements. Can you address me about it?
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OpenBSD Set Date and Time

Q. How do I set new date and time under OpenBSD UNIX server?
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