Brief description of & quot; 2 & gt; & amp; 1 & quot; in linux shell

Source: Internet
Author: User

In linux shell, the meaning of "2> & 1" is analyzed: it takes 10 hours to compile the Android operating system code, which may cause problems during the compilation process and facilitate debugging.
You need to output the compilation process to the file. In this way, you can also set automatic shutdown. Solution: Run make TARGET_PRODUCT = stalker OMAPES = 5.x-j4 2> & 1 | tee makelog. log is followed by: 2> & 1 | tee makelog. log to output logs to makelog. log File. Reference: material 1: command> out. file 2> & 1 & command> out. file redirects command output to out. file, that is, the output content is not printed to the screen, but to the out. file. 2> & 1 redirects a standard error to the standard output. The standard output has been redirected to the out. file, which outputs a standard error to the out. file. The last & is to run the command in the background. Material 2: You can use ls 2> 1 to test it. The system does not report the error of NO 2 files, but outputs an empty file 1. ls xxx 2> 1 to test, if the file xxx does not exist, the error is output to 1. If ls xxx 2> & 1 is tested, the file 1 is not generated, but the error is returned to the standard output; ls xxx> out.txt 2> & 1, which can be changed to ls xxx 1> out.txt 2> & 1; the redirection symbol> timeout is a error and the output is transmitted to out.txt. Author: lifeiaidajia

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