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ProcessConnection[proc,"stream"]

returns the stream object for a given stream.

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ProcessConnection

ProcessConnection[proc,"stream"]

returns the stream object for a given stream.

Details

  • Possible stream values are:
  • "StandardInput"a stream that can be written to, from which the process will read
    "StandardOutput"a stream that can be read from, to which the process will write
    "StandardError"an error stream that can be read from, to which the process will write

Examples

Basic Examples  (2)

Start the system shell process:

Wolfram Language code: process = StartProcess[$SystemShell]

Write a shell command:

Wolfram Language code: WriteLine[process, "echo some text for standard output"];

Read the shell command output:

Wolfram Language code: ReadLine[process]

Write an invalid shell command:

Wolfram Language code: WriteLine[process, "invalid command"];

Use ProcessConnection to read from the standard error stream:

Wolfram Language code: ReadLine[ProcessConnection[process, "StandardError"]]

Start the system shell process:

Wolfram Language code: process = StartProcess[$SystemShell]

Get the standard input stream using ProcessConnection:

Wolfram Language code: input = ProcessConnection[process, "StandardInput"]

Get the standard output stream using ProcessConnection:

Wolfram Language code: output = ProcessConnection[process, "StandardOutput"]

Write two commands into the shell. A process and its streams can be used interchangeably in most cases:

Wolfram Language code: WriteLine[input, "echo line 1"];
Wolfram Language code: WriteLine[process, "echo line 2"];

Read the two command outputs:

Wolfram Language code: ReadLine[process]
Wolfram Language code: ReadLine[output]
Wolfram Research (2014), ProcessConnection, Wolfram Language function, https://reference.wolfram.com/language/ref/ProcessConnection.html.

Text

Wolfram Research (2014), ProcessConnection, Wolfram Language function, https://reference.wolfram.com/language/ref/ProcessConnection.html.

CMS

Wolfram Language. 2014. "ProcessConnection." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ProcessConnection.html.

APA

Wolfram Language. (2014). ProcessConnection. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ProcessConnection.html

BibTeX

@misc{reference.wolfram_2026_processconnection, author="Wolfram Research", title="{ProcessConnection}", year="2014", howpublished="\url{https://reference.wolfram.com/language/ref/ProcessConnection.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_processconnection, organization={Wolfram Research}, title={ProcessConnection}, year={2014}, url={https://reference.wolfram.com/language/ref/ProcessConnection.html}, note=[Accessed: 13-June-2026]}