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The editor today takes you to understand how the Linux system outputs the command results to a file. The knowledge points in the article are introduced in great detail. Friends who think it is helpful can browse the content of the article with the editor, hoping to help more friends who want to solve this problem to find the answer to the problem. Let's follow the editor to learn more about "Linux system how to output command results to a file".

1. Overwrite write: echo Log contents > file

two。 Append write: echo "log contents" > > file

Meaning of "2 > & 1" in 3.linux shell:

For & 1, more accurately, it should be the file descriptor 1, while 1 identifies the standard output, stdout.

For 2, it means standard error, stderr. 2 > & 1 means to redirect standard error to standard output.

Index.php task testOne > / dev/null 2 > & 1 (ignore all output)

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