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redirect stdout to file

BASH Shell Redirect Output and Errors To /dev/null

How do I redirect output and errors to /dev/null under bash / sh shell scripting? How do I redirect the output of stderr to stdout, and then redirect this combined output to /dev/null device? In Unix, how do I redirect error messages to /dev/null?
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Q. How do I redirect stderr to stdout? How do I redirect stderr to a file?
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