Parsing 试图用Golang在命令行上解析stdout
我正在练习使用GoLang将参数传递到命令行,并能够从传递的结果中解析信息。例如,我的代码设计用于执行命令,并显示如果通过cmd输入命令,将显示的内容Parsing 试图用Golang在命令行上解析stdout,parsing,go,command-line,Parsing,Go,Command Line,我正在练习使用GoLang将参数传递到命令行,并能够从传递的结果中解析信息。例如,我的代码设计用于执行命令,并显示如果通过cmd输入命令,将显示的内容 package main import ( "bytes" "fmt" "os" "os/exec" "strings" ) func main() { cmd = exec.Command("ping", "8.8.8.8") cmdOutput = &bytes.Buffer
package main
import (
"bytes"
"fmt"
"os"
"os/exec"
"strings"
)
func main() {
cmd = exec.Command("ping", "8.8.8.8")
cmdOutput = &bytes.Buffer{}
cmd.Stdout = cmdOutput
printCommand(cmd)
err = cmd.Run()
printError(err)
printOutput(cmdOutput.Bytes())
}
func printCommand(cmd *exec.Cmd) {
fmt.Printf("==> Executing: %s\n", strings.Join(cmd.Args, " "))
}
func printError(err error) {
if err != nil {
os.Stderr.WriteString(fmt.Sprintf("==> Error: %s\n", err.Error()))
}
}
func printOutput(outs []byte) {
if len(outs) > 0 {
fmt.Printf("==> Output: %s\n", string(outs))
}
}
考虑到产出将是:
==> Executing: ping 8.8.8.8
==> Output:
Pinging 8.8.8.8 with 32 bytes of data:
Reply from 8.8.8.8: bytes=32 time=13ms TTL=56
Reply from 8.8.8.8: bytes=32 time=13ms TTL=56
Reply from 8.8.8.8: bytes=32 time=14ms TTL=56
Reply from 8.8.8.8: bytes=32 time=11ms TTL=56
Ping statistics for 8.8.8.8:
Packets: Sent = 4, Received = 4, Lost = 0 (0% lo
Approximate round trip times in milli-seconds:
Minimum = 11ms, Maximum = 14ms, Average = 12ms
我的问题是:如果我想解析平均响应时间,那么我可以将其分配给一个变量,以便在需要时显示它,那么我如何解析它 您可以使用
regexp
。例如:
package main
import (
"bytes"
"fmt"
"os"
"os/exec"
"regexp"
"strings"
"time"
)
type Ping struct {
average time.Duration
}
func main() {
cmd := exec.Command("ping", "8.8.8.8")
// Linux version
//cmd := exec.Command("ping", "-c 4", "8.8.8.8")
cmdOutput := &bytes.Buffer{}
cmd.Stdout = cmdOutput
printCommand(cmd)
err := cmd.Run()
printError(err)
output := cmdOutput.Bytes()
printOutput(output)
ping := Ping{}
parseOutput(output, &ping)
fmt.Println(ping)
}
func printCommand(cmd *exec.Cmd) {
fmt.Printf("==> Executing: %s\n", strings.Join(cmd.Args, " "))
}
func printError(err error) {
if err != nil {
os.Stderr.WriteString(fmt.Sprintf("==> Error: %s\n", err.Error()))
}
}
func printOutput(outs []byte) {
if len(outs) > 0 {
fmt.Printf("==> Output: %s\n", string(outs))
}
}
func parseOutput(outs []byte, ping *Ping) {
var average = regexp.MustCompile(`Average = (\d+ms)`)
result := average.FindStringSubmatch(string(outs))
if len(result) > 0 {
ping.average, _ = time.ParseDuration(result[1])
}
// Linux version
/*var average = regexp.MustCompile(`min\/avg\/max\/mdev = (0\.\d+)\/(0\.\d+)\/(0\.\d+)\/(0\.\d+) ms`)
result := average.FindAllStringSubmatch(string(outs), -1)
if len(result) > 0 {
ping.average, _ = time.ParseDuration(result[0][2] + "ms")
}*/
}
请注意,这将是特定于系统的。其他系统上的输出格式将有所不同,而IIRC Windows
ping
是唯一一个总是在4个数据包之后退出的系统。因此,具体来说,我将主要在Windows 7和Server 2008 R2上工作。我正在练习编写运行程序的程序,我想学习如何解析正在显示的信息。我以ping为例,希望能够解析输出,让其显示在用户界面更友好的地方。清晰、简单、很棒!感谢您将我的cmdOutput.Bytes()编辑为更易于管理的输出,以便稍后调用。所以专注于复杂的事情,我忘记了简单的事情。