Golang: System Call

By Xah Lee. Date: .

To make a system call, use

import "os/exec"

First, build your command. e.g.

var cmd = exec.Command(cmdName, arg1, arg2)

Each arg should not contain any space.

then, you have several choices how you want to run it. The main choices are:

if you need to change dir before running the command, use

os.Chdir(path)

package main

// example of calling shell command

// cd to a given dir
// call ls -al
// print its output

import "fmt"
import "os"
import "os/exec"

func main() {

    var dirToRun = "/Users/xah/web/"
    var err = os.Chdir(dirToRun)
    if err != nil {
        panic(err)
    }

    var cmdName = "ls"

    var cmd = exec.Command(cmdName, "-a", "-l")

    output, err := cmd.Output()
    if err != nil {
        panic(err)
    }

    fmt.Printf("%v\n", string(output))

}

Reference

https://golang.org/pkg/os/exec/

If you have a question, put $5 at patreon and message me.

Golang

  1. Compile, Run
  2. Source Encoding
  3. Package, Import
  4. Comment
  5. Print
  6. String
  7. String Backslash Escape
  8. Rune
  9. Variable
  10. Zero Value
  11. Constant
  12. If Then Else
  13. Switch/Case
  14. Loop
  15. Basic Types
  16. Array
  17. Slice
  18. Map
  19. Struct
  20. Function
  21. String as Chars
  22. regexp
  23. Read File
  24. Write to File
  25. Walk Dir
  26. Check File Exist
  27. System Call
  28. Get Script Path
  29. Pointer
  30. Defer
  31. Random Number

Examples

  1. match any regexp
  2. Validate Links
  3. Generate Sitemap

Reference

  1. Go Spec