Brief Introduction to redirecting linux Command applications and syntax

The following describes how to redirect linux Command applications and syntaxes, including standard input control methods and some command syntaxes. Hope to help you.

1. Standard input control

Syntax: The command file sends the command execution result to the specified file.

For example, ls-l> list writes the result of executing the "ls-l" command to the file list.
Syntax: Command>! The file sends the command execution result to the specified file. If the file already exists, it overwrites it.

Example: ls-lg>! List overwrites the result of executing the "ls-lg" command to the file list.

Syntax: Command> & file: write any information generated on the screen during command execution to the specified file.

For example, cc file1.c> & error writes any information generated when the file1.c file is compiled into the file error.

Syntax: Command> file: attaches the command execution result to the specified file.

For example, ls-lag> list attaches the result of executing the "ls-lag" command to the file list.

Syntax: Command> & file: attaches any information generated on the screen during command execution to the specified file.

For example, cc file2.c >>& error attaches any information generated on the screen when the file2.c file is compiled to the file error.

2. command syntax

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 filename2 uses the command file as the standard input and filename2 as the standard output.

Command & m redirects standard output to file descriptor m

We hope that the above linux Command application and syntax will help you.

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