Combine Output Streams with >&

Q

How to use the duplication redirection to combine one output stream into another output stream? I want to combine STDERR and STDIN together and send them to a file.

✍: FYIcenter.com

A

To combine one output stream into another output stream, you can use the duplication redirection operator as described below:

command options redirections x>&y
  Combines output stream handler x into y

For example, the following combines handler 2 (STDERR) into handler 1 (STDOUT). So info.txt will get both outputs and error.txt will be empty.

C:\fyicenter>dir junk 1> info.txt 2>error.txt 2>&1

For example, the following combines handler 1 (STDOUT) into handler 2 (STDERR). So error.txt will get both outputs and info.txt will be empty.

C:\fyicenter>dir junk 1> info.txt 2>error.txt 1>&2

Note that duplication redirection must be specified after other redirections. The following will not work:

C:\fyicenter>dir junk 1>&2 1> info.txt 2> error.txt

⇒ Pipe STDOUT of Previous Command as STDIN of Next

⇐ Use Handler Numbers with <, >, >>

⇑ Windows Command Syntax

⇑⇑ Windows Batch File Tutorials

2021-05-15, 1925👍, 0💬

Combine Output Streams with >&
How to use the duplication redirection to combine one output stream into another output stream? I want to combine STDERR and STDIN together and send them to a file. To combine one output stream into another output stream, you can use the duplication redirection operator as described below: command o... 2021-05-15, 1926👍, 0💬

Use Handler Numbers with <, >, >>
How to use input and output stream handler numbers with <, >, and >> redirections? When <, >, and >> redirections are used without handler numbers, a default input or output stream is used as described below: < Redirects handler 0 (STDIN... 2021-05-15, 1783👍, 0💬

Redirect STDIN Stream for Command to File
How to redirect STDIN stream from the keyboard to an existing file? I want the command to read data from a file. You can use the "<" redirect operator to redirect the STDIN stream from the keyboard to an existing file as shown below: command options < file-name For example, the "SORT" ... 2022-12-03, 1467👍, 0💬

File Name and File Path
Where to find introduction information on File Name and File Path? Here is a collection of tutorials compiled by FYIcenter.com team to provide introduction information on File Name and File Path. What Is File Name File Name with or without Drive Letter File Name with Relative Path or Absolute Path F... 2022-08-26, 1417👍, 0💬

Run Second Command If the First Successful
How to run two commands with a condition that the second one will run only if the first one is successful? You can run two commands with a condition that the second one will run only if the first one is successful with the syntax below: command-1 && command-2 For example, if you want... 2022-12-03, 1374👍, 0💬

Redirect STDOUT Stream to the End of File
How to redirect STDOUT stream from the screen to the end of a file? I want to append output from STDOUT stream to an existing file. When using the ">" redirection to an existing file, old content of the file will be replaced. You can keep the old content of the file by using the append redire... 2022-12-03, 1291👍, 0💬

Redirect STDOUT Stream for Command to File
How to redirect STDOUT stream from the screen to a file? I want the command to send output data to a file. By default, the STDOUT stream for a command is mapped the screen. If the command is writing data to the STDIN stream, you will see it on the screen. But, you can use the ">" redirect ope... 2022-12-03, 1287👍, 0💬

Run Second Command If the First Fails
How to run two commands with a condition that the second one will run only if the first one fails? You can run two commands with a condition that the second one will run only if the first one fails with the syntax below: command-1 || command-2 For example, if you want to write a message to the scree... 2022-08-26, 1260👍, 0💬

Input and Output Stream Handler Numbers
What are input and output stream handler numbers? Input and output stream handler numbers are integers assigned to represent input and output streams. The list below shows you how handler numbers are assigned to different input and output streams: Handler Number Stream 0 STDIN 1 STDOUT 2 STDERR 3 To... 2021-05-15, 1241👍, 0💬

All rights in the contents of this web site are reserved by the individual author. fyicenter.com does not guarantee the truthfulness, accuracy, or reliability of any contents.