How to Correctly Execute Piped Commands in Go using `exec.Command()`?

Executing Commands with Pipes in Go Using exec.Command()

When attempting to execute a command that involves piping, such as "ps cax | grep myapp", using exec.Command("ps", "cax | grep myapp").Output(), you may encounter an exit status 1 error.

To effectively handle such commands, a more idiomatic solution involves utilizing multiple exec.Command instances and connecting their input and output streams.

Here's a breakdown of how the idiomatic approach works:

1. Create the commands: Initialize separate exec.Command instances for each command in the pipeline, such as "ps" and "grep" in this case.
2. Connect the streams: Use the StdoutPipe and Stdin methods to connect the standard output of the "ps" command to the standard input of the "grep" command.
3. Start the first command: Start the first command in the pipeline, typically the one responsible for producing output, which is "ps" in our example.
4. Capture the output: Wait for the second command to finish and retrieve its output using the Output method.

By employing this approach, you can effectively execute commands that require chaining through pipes, ensuring proper handling of input and output streams.

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