Question

557

rated 0 times [ 557] [ 0] / answers: 1 / hits: 680722 / 11 Months ago, wed, january 25, 2023, 5:01:54

I would like a brief explanation of the following command line:

grep -i 'abc' content 2>/dev/null

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answered 11 Months ago mentpengu · Accepted Answer

The > operator redirects the output usually to a file but it can be to a device. You can also use >> to append.

If you don't specify a number then the standard output stream is assumed, but you can also redirect errors:

> file redirects stdout to file

1> file redirects stdout to file

2> file redirects stderr to file

&> file redirects stdout and stderr to file

> file 2>&1 redirects stdout and stderr to file

/dev/null is the null device it takes any input you want and throws it away. It can be used to suppress any output.

Note that > file 2>&1 is an older syntax which still works, &> file is neater, but would not have worked on older systems.