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The use of output, error, output append, error pursuit and emphasis orientation not only makes it easy for us to implement the contents of multiple commands in a single file, but also gives us a deeper understanding of Linux.

Program: instruction + data

Read in data: Input

Output data: Output

All open files have a fd: file descriptor (file descriptor)

Linux provides the program with three iBand O devices.

Standard input (STDIN)-0 accepts input from the keyboard by default

Standard output (STDOUT)-1 default output to terminal window

Standard error (STDERR)-2 default output to terminal window

1. Create a file using output redirection

two。 Use of output redirection

3. Output append redirection

4. Output redirection of error command

5. You can use 2 > to redirect the output of the error command.

6. Error command output append redirection

7. Show incorrect and correct output redirection with the same file

8. You can also use 2 > & 1 to output both incorrect and correct output redirections

9. Use different files to show the wrong and the right

10. You can use set-C to redirect output without overwriting the contents of the original file.

11. Use > | Force overwrite

twelve。 Unlock set + C

More than 13 commands output redirection simultaneously

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