在使用Go语言中的os.exec包时,获取命令执行的输出是一个常见的需求。但是,由于os.exec包的设计特点,直接获取输出并不是一件简单的事情。那么,如何从Go语言中的os.exec中获取命令的输出呢?在本文中,我们将为大家详细介绍一种简单有效的方法,帮助大家解决这个问题。无论你是初学者还是有经验的开发者,相信本文都能对你有所帮助。让我们一起来看看吧!
问题内容
我正在尝试从以下代码获取系统输出
cmdstring := "lxc exec " + containername + " -- ip addr show eth0 | grep 'inet\b' | awk '{print $2}' | cut -d/ -f1" ip, err := exec.command("bash", "-c", cmdstring).output() fmt.println(ip)
上面的代码应该从 lxc 容器获取 ip 地址。
go的实际输出是[]
我也尝试过以下方法
ip, err := exec.command("lxc", "exec ", containername, " --", "ip addr show eth0", "|", "grep", "'inet\b'", "| awk '{print $2}'", "| cut -d/", "-f1").output() fmt.println(ip)
我仍然只得到 []
作为输出
命令行的正确输出如下
[root@localhost toolbox]# lxc exec simon -- ip addr show eth0 | grep 'inet\b' | awk '{print $2}' | cut -d/ -f1 10.183.201.38
知道我做错了什么吗?
解决方法
阅读这段代码,您就可以了解如何读取结果的标准输出
package main import ( "bytes" "fmt" "os/exec" ) func main() { cmd := exec.Command("/usr/bin/ls") buf := bytes.Buffer{} cmd.Stdout = &buf err := cmd.Run() fmt.Println(buf.String(), err) }
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