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The following command will redirect stderr to a different file than the one stdout is redirected to:
command >log.txt 2>errors.txt;
In case you want to redirect stderr to stdout (&1), and then redirect stdout to a file you can use the following setup:
command >mixed-log.txt 2>&1;
The following command will have the same effect as the previous one, the difference between them is the way they are implemented. This time we will redirect both the stdout and stderr to a file:
command &> mixed-log.txt;