How to Redirect Exec Command Output to Your Log in Real Time in Golang?

Golang: Copying Exec Output to Log

Problem:

When executing a process using exec.Command, how can you redirect its output to your log in real-time?

Context:

The conventional approach of waiting for the process to complete and then logging its combined output is not suitable for long-running or unfinished processes. Writing to stdout in real-time is also not helpful for services that don't use terminals.

Solution:

To capture and log process output in real-time, you can utilize pipes:

stdout, err := cmd.StdoutPipe()
if err != nil {
    return 0, err
}

// Start the command after setting up the pipe
if err := cmd.Start(); err != nil {
    return 0, err
}

// Read the command's stdout line by line
in := bufio.NewScanner(stdout)

for in.Scan() {
    log.Printf(in.Text()) // Log each line
}

if err := in.Err(); err != nil {
    log.Printf("error: %s", err)
}

This approach allows you to capture both stdout and stderr by using a goroutine.

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