How to Detect If a Command is Piped in Go?

Pipe Detection in Go

In Go, detecting if a command is piped is crucial for tailoring its behavior appropriately. A piped command receives input from another command through a pipe, while a non-piped command interacts directly with the terminal.

To determine if a command is piped, utilize the os.Stdin.Stat() function to examine the file info of the standard input (Stdin). If the file's Mode returns a value with the os.ModeCharDevice bit cleared, it indicates that the data is coming from a pipe. Otherwise, it suggests that the data is being inputted from the terminal.

Below is an example to illustrate:

<code class="go">package main

import (
    "fmt"
    "os"
)

func main() {
    fi, _ := os.Stdin.Stat()

    if (fi.Mode() & os.ModeCharDevice) == 0 {
        fmt.Println("data is from pipe")
    } else {
        fmt.Println("data is from terminal")
    }
}</code>

In this script, the os.Stdin.Stat() function checks the file information associated with the standard input. If the resulting Mode indicates a file that is not a character device (pipe), it prints "data is from pipe." Otherwise, it prints "data is from terminal."

By leveraging os.Stdin.Stat() to detect pipe usage, you can optimize your Go commands to handle piped input efficiently and provide a seamless user experience.

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