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existence

Bash Shell: Check File Exists or Not

How do I test existence of a text file in bash running under Unix like operating systems?
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Bash Shell: Find Out If a Variable Is Set or Not

How do I check if a bash shell variable called $input is defined or not under BSD / Apple OS X / Unix / Linux like operating systems?
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nginx: Send HTTP User Agent Requests To Specific Backend Server

How do I check if a file called /tmp/foo.txt exists or not using a shell script under Linux operating systems?
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