英文:
os.Exec and /bin/sh: executing multiple commands
问题
我遇到了os/exec库的一个问题。我想运行一个shell并传递多个命令进行执行，但是当我这样做时它失败了。以下是我的测试代码：
package main
import (
"fmt"
"os/exec"
)
func main() {
fmt.Printf("-- Test 1 --\n")
command1 := fmt.Sprintf("\"%s\"", "pwd") // this one succeeds
fmt.Printf("Running: %s\n", command1)
cmd1 := exec.Command("/bin/sh", "-c", command1)
output1,err1 := cmd1.CombinedOutput()
if err1 != nil {
fmt.Printf("error: %v\n", err1)
return
}
fmt.Printf(string(output1))
fmt.Printf("-- Test 2 --\n")
command2 := fmt.Sprintf("\"%s\"", "pwd && pwd") // this one fails
fmt.Printf("Running: %s\n", command2)
cmd2 := exec.Command("/bin/sh", "-c", command2)
output2,err2 := cmd2.CombinedOutput()
if err2 != nil {
fmt.Printf("error: %v\n", err2)
return
}
fmt.Printf(string(output2))
}
运行这段代码时，第二个示例会出现错误127。似乎它正在寻找一个字面上的"pwd && pwd"命令，而不是将其作为脚本进行评估。
如果我从命令行执行相同的操作，它就可以正常工作。
$ /bin/sh -c "pwd && pwd"
我正在使用Go 1.4和OS X 10.10.2。
英文:
I've run into an issue with the os/exec library. I want to run a shell and pass it multiple commands to run, but it's failing when I do. Here's my test code:
package main
import (
"fmt"
"os/exec"
)
func main() {
fmt.Printf("-- Test 1 --\n`")
command1 := fmt.Sprintf("\"%s\"", "pwd") // this one succeeds
fmt.Printf("Running: %s\n", command1)
cmd1 := exec.Command("/bin/sh", "-c", command1)
output1,err1 := cmd1.CombinedOutput()
if err1 != nil {
fmt.Printf("error: %v\n", err1)
return
}
fmt.Printf(string(output1))
fmt.Printf("-- Test 2 --\n")
command2 := fmt.Sprintf("\"%s\"", "pwd && pwd") // this one fails
fmt.Printf("Running: %s\n", command2)
cmd2 := exec.Command("/bin/sh", "-c", command2)
output2,err2 := cmd2.CombinedOutput()
if err2 != nil {
fmt.Printf("error: %v\n", err2)
return
}
fmt.Printf(string(output2))
}
When running this I get an error 127 on the second example. It seems like it's looking for a literal "pwd && pwd" command instead of evaluating it as a script.
If I do the same thing from the command line it works just fine.
$ /bin/sh -c "pwd && pwd"
I'm using Go 1.4 on OS X 10.10.2.
答案1
得分: 2
引号是用于您在命令行中输入命令的外壳，当以编程方式启动应用程序时，不应包含在内。
只需进行以下更改，它就会正常工作：
command2 := "pwd && pwd" // 您不需要额外的引号
英文:
the quotes are for your shell where you typed the command line, they should not be included when programatically launching an app
just make this change and it will work:
command2 := "pwd && pwd" // you don't want the extra quotes
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