英文:
The go language exec.Command method execute failed
问题
这个命令执行失败了，并且没有log.txt存在。
为什么？
英文:
package main
import (
"os/exec"
"fmt"
)
func main(){
cmd := exec.Command("find", "/home/d101270c/cbe", "-name","*.log", ">", "log.txt")
fmt.Println(cmd)
err := cmd.Run()
if err != nil {
fmt.Printf("%s\n", err)
return
}
}
Run result:
<1067 linux20 [d101270c] :/home/d101270c>uname -a
Linux linux20 2.6.16.60-0.21-smp #1 SMP Tue May 6 12:41:02 UTC 2008 x86_64 x86_64 x86_64 GNU/Linux
<1068 linux20 [d101270c] :/home/d101270c>tgo
&{/usr/bin/find [find /home/d101270c/cbe -name *.log > log.txt] [] <nil> <nil> <nil> [] <nil> <nil> <nil> <nil> false [] [] [] [] <nil>}
exit status 1
This command execute failed, and no log.txt exists.
Why?
答案1
得分: 3
你正在传递find的参数，比如>'，它无法理解，但是shell可以。这对我有效：
(07:28) jnml@tsat:~/src/tmp/SO/11623232$ cat main.go
package main
import (
"fmt"
"os"
"os/exec"
)
func main() {
//cmd := exec.Command("sh", "-c", "find /home/d101270c/cbe -name \\*.log > log.txt")
cmd := exec.Command("sh", "-c", "find "+os.Getenv("HOME")+"/src -name \\*.go > go.txt")
fmt.Println(cmd)
err := cmd.Run()
if err != nil {
fmt.Printf("%s\n", err)
return
}
}
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ go build main.go
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ ./main
&{/bin/sh [sh -c find /home/jnml/src -name \*.go > go.txt] [] <nil> <nil> <nil> [] <nil> <nil> <nil> <nil> false [] [] [] [] <nil>}
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ ls -l
celkem 1408
-rw-r--r-- 1 jnml jnml 7845 2012-07-24 07:29 go.txt
-rwxr-xr-x 1 jnml jnml 1428319 2012-07-24 07:29 main
-rw-r--r-- 1 jnml jnml 332 2012-07-24 07:28 main.go
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ wc go.txt
131 131 7845 go.txt
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ tail go.txt
/home/jnml/src/github.com/nsf/gocode/config.go
/home/jnml/src/github.com/nsf/gocode/rpc.go
/home/jnml/src/github.com/nsf/gocode/_gccgo/package.go
/home/jnml/src/github.com/nsf/gocode/_goremote/goremote.go
/home/jnml/src/github.com/nsf/gocode/scope.go
/home/jnml/src/github.com/nsf/gocode/formatters.go
/home/jnml/src/github.com/nsf/gocode/autocompletefile.go
/home/jnml/src/github.com/nsf/gocode/decl.go
/home/jnml/src/tmp/go/main.go
/home/jnml/src/tmp/SO/11623232/main.go
(07:29) jnml@tsat:~/src/tmp/SO/11623232$
英文:
You're passing find arguments like `>', which it doesn't understand, but the shell does. This works for me:
(07:28) jnml@tsat:~/src/tmp/SO/11623232$ cat main.go
package main
import (
"fmt"
"os"
"os/exec"
)
func main() {
//cmd := exec.Command("sh", "-c", "find /home/d101270c/cbe -name \\*.log > log.txt")
cmd := exec.Command("sh", "-c", "find "+os.Getenv("HOME")+"/src -name \\*.go > go.txt")
fmt.Println(cmd)
err := cmd.Run()
if err != nil {
fmt.Printf("%s\n", err)
return
}
}
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ go build main.go
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ ./main
&{/bin/sh [sh -c find /home/jnml/src -name \*.go > go.txt] [] <nil> <nil> <nil> [] <nil> <nil> <nil> <nil> false [] [] [] [] <nil>}
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ ls -l
celkem 1408
-rw-r--r-- 1 jnml jnml 7845 2012-07-24 07:29 go.txt
-rwxr-xr-x 1 jnml jnml 1428319 2012-07-24 07:29 main
-rw-r--r-- 1 jnml jnml 332 2012-07-24 07:28 main.go
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ wc go.txt
131 131 7845 go.txt
(07:29) jnml@tsat:~/src/tmp/SO/11623232$ tail go.txt
/home/jnml/src/github.com/nsf/gocode/config.go
/home/jnml/src/github.com/nsf/gocode/rpc.go
/home/jnml/src/github.com/nsf/gocode/_gccgo/package.go
/home/jnml/src/github.com/nsf/gocode/_goremote/goremote.go
/home/jnml/src/github.com/nsf/gocode/scope.go
/home/jnml/src/github.com/nsf/gocode/formatters.go
/home/jnml/src/github.com/nsf/gocode/autocompletefile.go
/home/jnml/src/github.com/nsf/gocode/decl.go
/home/jnml/src/tmp/go/main.go
/home/jnml/src/tmp/SO/11623232/main.go
(07:29) jnml@tsat:~/src/tmp/SO/11623232$
答案2
得分: 1
也许，在这里你甚至不需要使用shell。请参考http://golang.org/pkg/os/exec/#Cmd.Output。
Alex
英文:
Perhaps, you do not even need to use shell here. See http://golang.org/pkg/os/exec/#Cmd.Output.
Alex
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