redirect stderr to file

I‘m a new Linux system user. How can I redirect command error output /dev/null on a Linux or Unix-like system using Bash shell?

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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?

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Q. How do I redirect stderr to stdout? How do I redirect stderr to a file?

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