Created
March 11, 2020 22:47
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show progress and capture example for https://blog.kowalczyk.info/article/wOYk/advanced-command-execution-in-go-with-osexec.html (made with https://codeeval.dev)
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package main | |
// https://blog.kowalczyk.info/article/wOYk/advanced-command-execution-in-go-with-osexec.html | |
import ( | |
"bytes" | |
"fmt" | |
"io" | |
"log" | |
"os" | |
"os/exec" | |
"runtime" | |
"sync" | |
) | |
func main() { | |
cmd := exec.Command("ls", "-lah") | |
if runtime.GOOS == "windows" { | |
cmd = exec.Command("tasklist") | |
} | |
var stdoutBuf, stderrBuf bytes.Buffer | |
stdoutIn, _ := cmd.StdoutPipe() | |
stderrIn, _ := cmd.StderrPipe() | |
var errStdout, errStderr error | |
stdout := io.MultiWriter(os.Stdout, &stdoutBuf) | |
stderr := io.MultiWriter(os.Stderr, &stderrBuf) | |
err := cmd.Start() | |
if err != nil { | |
log.Fatalf("cmd.Start() failed with '%s'\n", err) | |
} | |
var wg sync.WaitGroup | |
wg.Add(1) | |
go func() { | |
_, errStdout = io.Copy(stdout, stdoutIn) | |
wg.Done() | |
}() | |
_, errStderr = io.Copy(stderr, stderrIn) | |
wg.Wait() | |
err = cmd.Wait() | |
if err != nil { | |
log.Fatalf("cmd.Run() failed with %s\n", err) | |
} | |
if errStdout != nil || errStderr != nil { | |
log.Fatal("failed to capture stdout or stderr\n") | |
} | |
outStr, errStr := string(stdoutBuf.Bytes()), string(stderrBuf.Bytes()) | |
fmt.Printf("\nout:\n%s\nerr:\n%s\n", outStr, errStr) | |
} |
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