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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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