en:docs:cmd:other:piping

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en:docs:cmd:other:piping [2014/05/24 05:34] – created valeriusen:docs:cmd:other:piping [Unknown date] (current) – removed - external edit (Unknown date) 127.0.0.1
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-===== Piping ===== 
- 
-You can create a "pipe" to send the standard output of one command to the standard input of another command:  
- 
-|command1 \\| command2Send   |the standard output of command1 to the standard input of command2 | 
-|command1 \\|& command2Send |the standard output and standard error of command1 to the standard input of command2 | 
- 
-For example, to take the output of the **SET** command (which displays a list of your environment variables and their values) and pipe it to the **SORT** utility to generate a sorted list, you would use the command:  
- 
-<code> 
-        [c:\] set | sort 
-</code> 
- 
-To do the same thing and then pipe the sorted list to the internal **[[LIST]]** command for full-screen viewing:  
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-<code> 
-        [c:\] set | sort | list 
-</code> 
- 
-The **[[TEE]]** and **[[Y]]** commands are "pipe fittings" which add more flexibility to pipes.  
- 
-Like redirection, pipes are fully nestable. For example, you can invoke a batch file and send all of its output to another command with a pipe. A pipe on a command within the batch file will take effect for that command only; when the command is completed, output will revert to the pipe in use for the batch file as a whole. You may also have 2 or more pipes operating simultaneously if, for example, you have the pipes running in different windows.  
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-**CMD.EXE** implements pipes by starting a new process for the receiving program instead of using temporary files. The sending and receiving programs run simultaneously; the sending program writes to the pipe and the receiving program reads from the pipe. When the receiving program finishes reading and processing the piped data, it is ends automatically.  
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-When you use pipes with **CMD.EXE** make sure you think about any possible consequences that can occur from using a separate process to run the receiving program.