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redirect stderr to file

Unix and Linux: Redirect Error Output To null Command

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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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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BASH Shell: How To Redirect stderr To stdout ( redirect stderr to a File )

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