Golang - Execute command

Question

Prompt as in golang to execute such command:

/bin/bash script.sh < text.txt

I execute a script with parameters so:

package main

import (
    "fmt"
    "os/exec"
    "log"
    "os"
)

func main() {
    argstr := []string{"script.sh", "arg1", "arg2"}
    out, err := exec.Command("/bin/bash", argstr...).Output()
    if err != nil {
        log.Fatal(err)
        os.Exit(1)
    }
    fmt.Println(string(out))
}

And here is how to transfer an output from the text file?

Grzegorz Żur · Accepted Answer · 2016-10-08 08:00:10Z

3

The command you should execute is:

/bin/bash -c 'script.sh < text.txt'

So

argstr := []string{"-c", "script.sh < text.txt"}

Bash will interpret input redirection and will do the job.

answered Oct 8, 2016 at 8:00

Grzegorz Żur

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3 Comments

mister87 Over a year ago

Thanks! It works! Also I found one more method: func main() { cmd := exec.Command("/bin/bash", "script.sh") cmd.Stdin = strings.NewReader("text of the test.txt file") var out bytes.Buffer cmd.Stdout = &out err := cmd.Run() if err != nil { log.Fatal(err) os.Exit(1) } fmt.Println(out.String()) }

Grzegorz Żur Over a year ago

@Konstantin You can add the other method as a new answer. I would just use os.Open to read the file.

mister87 Over a year ago

Hello! Yes, it is already possible! Thank you for the help! Whether interestingly, perhaps to make similar not only through execution of bash-commands (a package of "os/exec"), and through implementation of the client of ssh (for example, means of a package of "crypto/ssh")?

flapjack · Accepted Answer · 2017-09-18 22:40:31Z

0

Pro Tip: Don't forget to timeout

ctx, cancel := context.WithTimeout(context.Background(), 4*time.Second)
defer cancel()
argstr := []string{"/bin/bash", "-c", "script.sh < text.txt"}
cmd := exec.CommandContext(ctx, argstr...)
cmd.Stderr = &errorBuffer
cmd.Stdout = &outputBuffer
err := cmd.Run()
if err != nil {
    return fmt.Errorf("something bad happened: %v", err)
}

I always suggest to play safe.

edited Sep 18, 2017 at 22:40

answered Sep 18, 2017 at 0:54

flapjack

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2 Comments

zerkms Over a year ago

Is it for some other question?

flapjack Over a year ago

Yeah, thinking better. The title and the question were somewhat confusing. :\ Looks like the problem it's pretty much about how to handle parameters with exec.Command() and bash.

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