Common Linux File redirection commands

 

I recently learned about Linux Shell and encountered a file redirection character. I thought it was useful and I sorted it out:

In shell programs, there are about three most commonly used FD types, with the following differences:

0: Standard Input (STDIN)

1: Standard Output (STDOUT)

2: Standard Error Output (STDERR)

 

In the standard environment, these FD points are not associated with the following devices:

Stdin (0): keyboard

Stdout (1): monitor

Stderr (2): monitor

 

Command> filename redirects the standard output to a new file

Command> filename redirects the standard output to a file (append)

Command 1> fielname redirects standard output to a file

Command> filename 2> & 1 redirects the standard output and standard error to a file.

Command 2> filename redirects a standard error to a file

Command 2> filename redirects the standard output to a file (append)

Command> filename 2> & 1 redirects the standard output and standard error to a file (append)

Command <filename> filename2 uses the command as the standard input in the filename file and filename2 as the standard output.

Command <filename: The command is input using the filename file as the standard.

Command <delimiter reads data from the standard input until the delimiter is encountered.

Command <& m uses the file descriptor m as the standard input

Command> & m redirects standard output to file descriptor m

Command <&-Disable Standard Input

 

From zookeeper D. Release