Linux notes data stream redirection

Linux notes data stream redirection-Linux general technology-Linux programming and kernel information. The following is a detailed description. Data Stream redirection means that the command output is directly input to other devices, such as files, printers, or garbage bins, instead of printing on the screen.

Command [option] parameter >|>>| 1 >|2 >|2> file or print Device

> Indicates that the redirection output is like ls/tmp/man. config>/tmp/out.txt ls results should have been output on the screen, but> information is used to output to the out.txt file. If the out.txt file does not exist, it will be automatically created.

>>And> the same meaning, but if you use >> if out.txt already exists, add the content output to out.txt.

2> only output error information. If the executed command has both error information and correct output, you can use 2> re-import to other files.

For example, find-name/home/test>/tmp/out.txt 2>/tmp/error.txt output the correct information to/tmp/out.txt output to error.txt

<It indicates the meaning of importing from a file to another file. For example, cat> text.txt will be automatically imported to text.txt after you press ctrl1_d. If cat> text.txt <somtext.txt is imported to test.txt

<Eof indicates that the input ends. It can replace CTRL + d, for example, cat> text.txt <