How to redirect linux commands

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1. Control of standard input

Syntax: the command file sends the execution results of the command to the specified file.

For example: ls-l > list writes the result of the "ls-l" command to the file list.

Syntax: command >! The file sends the execution result of the command to the specified file, and if the file already exists, it is overwritten.

For example: ls-lg >! List overwrites the results of the "ls-lg" command to the file list.

Syntax: command > & File writes any information generated on the screen when the command is executed to the specified file.

For example: cc file1.c > & error writes any information generated when compiling the file1.c file to the file error.

Syntax: command > > file appends the result of command execution to the specified file.

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

Syntax: command > > & File appends any information generated on the screen when the command is executed to the specified file.

For example: cc file2.c > > & error appends any information generated by the screen when compiling the file2.c file to the file error.

2 command syntax

Command > filename redirects standard output to a new file

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

Command 1 > fielname redirects standard output to a file

Command > filename 2 > & 1 redirect standard output and standard error to a file together

Command 2 > filename redirects standard error to a file

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

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

Command filename2 uses filename files as standard input and filename2 files as standard output for command commands.

Command & m redirects standard output to the file descriptor m

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