Input and Output Stream Handler Numbers

Q

What are input and output stream handler numbers?

✍: FYIcenter.com

A

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 be defined by applicaitons                   
...
9                   To be defined by applicaitons

⇒ Use Handler Numbers with <, >, >>

⇐ Redirect STDOUT Stream to the End of File

⇑ Windows Command Syntax

⇑⇑ Windows Batch File Tutorials

2021-05-15, ∼2620🔥, 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, ∼4471🔥, 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, ∼4257🔥, 0💬

Manage Space in Command Option
How to manage space characters in the command option? If command option has space characters, you have to enclose the command option between a pair of double quotes. For example, if you want search for files named partially as "Bug Fix" on the hard disk, you can end this command: C:\>dir /b /... 2022-12-23, ∼3898🔥, 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, ∼3390🔥, 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, ∼3070🔥, 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, ∼2940🔥, 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, ∼2917🔥, 0💬

Default STDIN Stream for Command - Keyboard
What is the default STDIN stream for a command? Can I use the keyboard to enter data for the STDIN stream? By default, the STDIN stream for a command is mapped the keyboard. If the command is reading data from the STDIN stream, you can enter it from the keyboard. For example, the "SORT" command read... 2022-12-03, ∼2914🔥, 0💬

Pipe STDOUT of Previous Command as STDIN of Next
How to redirect (or pipe) STDOUT stream from the first command as STDIN stream of the next command? If you want to pipe two commands together by redirecting the STDOUT stream of the first command as the STDIN stream of the second command, you can use the pipe redirection operator "|" as shown below:... 2021-05-15, ∼2706🔥, 0💬

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