Example Analysis of system input and output in linux

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1. Understand the input and output of the system

In a linux system, 1 indicates correct output and 2 indicates error output

two。 Symbols for managing input and output

(1) output redirection (output to the specified location)

> # # redirect correct output 2 > # redirect error output & > # redirect all output

Note: the following experiments should be completed among ordinary users

Find / etc/-name passwd > file1 # # directs correct output to file1 (error output that is not in the file will be displayed) find / etc/-name passwd 2 > file2 # # directs error output to file2 (correct output not put in file will be displayed) find / etc/-name passwd & > file3 # # directs all output to file3

File # # clear file (because the source file is overwritten when the'> 'symbol is output, > file overwrites the source file with blank space, which can be emptied)

(2) output append

> > # # append correct output to the last 2 > # # append error output to the end of the file & > > # # append all output to the end of the file

Note: append does not overwrite the contents of the source file

(3) input redirection

& 1 | tee file | wc-lumped # change the error output numbered 2 to the correct output numbered 1 and put it into the file file together and count the number

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