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  • Spawning process _ golang

    Sometimes our Go programs need to spawn other, non-Go process. For example, the syntax highlighting on this site is implemented by spawning a pygmentize process from a Go program. Let's look at a few examples of spawning processes from Go

    package main
    
    import (
        "fmt"
        "io/ioutil"
        "os/exec"
    )
    
    func main() {
    
        dateCmd := exec.Command("date")
    
        dateOut, err := dateCmd.Output()
        if err != nil {
            panic(err)
        }
    
        fmt.Println("> date")
        fmt.Println(string(dateOut))
    
        grepCmd := exec.Command("grep", "hello")
    
        grepIn, _ := grepCmd.StdinPipe()
        grepOut, _ := grepCmd.StdoutPipe()
        grepCmd.Start()
        grepIn.Write([]byte("hello grep
    goodbye grep"))
        grepIn.Close()
        grepBytes, _ := ioutil.ReadAll(grepOut)
        grepCmd.Wait()
    
        fmt.Println("> grep hello")
        fmt.Println(string(grepBytes))
    
        lsCmd := exec.Command("bash", "-c", "ls -a -l -h")
        lsOut, err := lsCmd.Output()
        if err != nil {
            panic(err)
        }
    
        fmt.Println("> ls -a -l -h")
        fmt.Println(string(lsOut))
    }
    > date
    Wed Apr  1 13:15:32 CST 2015
    
    > grep hello
    hello grep
    
    > ls -a -l -h
    total 3648
    drwxr-xr-x  16 xjk  staff   544B Apr  1 13:09 .
    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   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.p

    总结 : 

      1 : ...

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  • 原文地址:https://www.cnblogs.com/jackkiexu/p/4383582.html
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