execing process _ golang

jackkiexu · · 2630 次点击 · · 开始浏览

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In the previous example we looked at spawning external processes. We do this when we need an external process accessible to running Go process. Sometimes we just want to completely replace the current Go process with another one. To do this we'll use Go's implementation of classic exec function

package main

import (
    "os"
    "os/exec"
    "syscall"
)

func main() {

    binary, lookErr := exec.LookPath("ls")
    if lookErr != nil {
        panic(lookErr)
    }

    args := []string{"ls", "-a", "-l", "-h"}

    env := os.Environ()

    execErr := syscall.Exec(binary, args, env)
    if execErr != nil {
        panic(execErr)
    }
}

total 3656
drwxr-xr-x  17 xjk  staff   578B Apr  1 13:19 .
drwxr-xr-x+ 30 xjk  staff   1.0K Mar  6 14:00 ..
-rw-r--r--@  1 xjk  staff   6.0K Mar 27 11:21 .DS_Store
-rw-r--r--   1 xjk  staff   838B Mar 30 13:38 Reading.go
-rw-r--r--   1 xjk  staff   553B Mar 27 13:12 URL.go
-rw-r--r--   1 xjk  staff   598B Mar 30 13:45 Writing.go
-rw-r--r--   1 xjk  staff   402B Mar 30 13:23 base64.go
-rw-r--r--   1 xjk  staff   447B Mar 31 13:28 commandLineFlags.go
-rwxr-xr-x   1 xjk  staff   1.7M Mar 31 13:21 commonLineArgument
-rw-r--r--   1 xjk  staff   209B Mar 31 13:20 commonLineArgument.go
-rw-r--r--   1 xjk  staff   261B Apr  1 13:02 environmentVariables.go
-rw-r--r--   1 xjk  staff   303B Apr  1 13:22 execingProcess.go
-rw-r--r--   1 xjk  staff   298B Mar 31 13:15 lineFilters.go
-rw-r--r--   1 xjk  staff   384B Mar 27 13:04 number_parsing.go
-rw-r--r--   1 xjk  staff   189B Mar 27 13:18 sha.go
-rw-r--r--   1 xjk  staff   720B Apr  1 13:15 spawningProcess.go
-rwxr-xr-x   1 xjk  staff   243B Mar 27 11:25 urllib001.py