Exec Process in Go
Calling exec completely replaces the current Go process with another (perhaps non-Go) one.
package main
import (
"os"
"os/exec"
"syscall"
)
func main() {
// For our example we’ll exec ls. Go requires an absolute path to the binary we want to execute,
// so we’ll use exec.LookPath to find it (probably /bin/ls).
binary, lookErr := exec.LookPath("ls")
if lookErr != nil {
panic(lookErr)
}
// Exec requires arguments in slice form (as apposed to one big string).
// We’ll give ls a few common arguments.
// Note that the first argument should be the program name.
args := []string{"ls", "-a", "-l", "-h"}
// Exec also needs a set of environment variables to use.
// Here we just provide our current environment.
env := os.Environ()
// Here’s the actual syscall.Exec call.
// If this call is successful, the execution of our process will end here and be replaced by the /bin/ls -a -l -h process.
// If there is an error we’ll get a return value.
execErr := syscall.Exec(binary, args, env)
if execErr != nil {
panic(execErr)
}
}