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How do I skip bash for loop if certain condition is satisfied under UNIX / Linux / BSD / OS X?

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How do I run a command using ssh under UNIX, OS X, *BSD, and Linux operating systems?

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How do I rename a file in bash under UNIX / OS X / Linux / BSD operating systems?

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Q. Can you tell me how to configure sudo to provide access to end users? How do I allow to run programs with the security privileges of another user using sudo?

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Both Linux / UNIX allows the data of a file to have more than one name in separate places in the same file system. Such a file with more than one name for the same data is called a hard-linked file. How do I create a hard link under Linux / UNIX / Apple Mac OS X / BSD operating systems?

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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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