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. Pointer
  22. String as Chars
  23. regexp
  24. Read File
  25. Write to File
  26. Walk Dir
  27. Check File Exist
  28. System Call
  29. Get Script Path
  30. Pointer
  31. Defer
  32. Random Number

Examples

  1. Match Any Regexp
  2. Find Replace
  3. Validate Links
  4. Generate Sitemap

Reference

  1. Go Spec