os, os/exec: using redirection symbol '<' '>' failed #11866
Comments
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go version: 1.4.1 linux/amd64 |
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The > is a feature of your shell language. To use it, you need to run your command inside a shell. Perhaps something like
Be careful with this though. If you construct a string and pass it to a shell, you need to think carefully about escaping and security. For the particular example you give, you may want to consider using os.Open, os.Create, and io.Copy. |
mikioh
changed the title
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just talk about package main
import (
"bytes"
"os/exec"
"testing"
)
func TestExe1(t *testing.T) {
out := &bytes.Buffer{}
cmd := exec.Command("bash", "-c", "cat ./file_not_exist > /tmp/aaa")
cmd.Stderr = out
err := cmd.Start()
if err != nil {
t.Errorf("start error %s [%s]", err, out.String())
}
err = cmd.Wait()
if err == nil {
t.Errorf("exit error %s [%s]", err, out.String())
}
cmd = exec.Command("bash", "-c", "echo hello > /tmp/aaa")
err = cmd.Start()
if err != nil {
t.Errorf("start error %s [%s]", err, out.String())
}
err = cmd.Wait()
if err == nil {
t.Errorf("exit error %s [%s]", err, out.String())
}
cmd = exec.Command("bash", "-c", "cat ./myself_test.go > /tmp/aaa")
err = cmd.Start()
if err != nil {
t.Errorf("start error %s [%s]", err, out.String())
}
err = cmd.Wait()
if err != nil {
t.Errorf("exit error %s [%s]", err, out.String())
}
}output is why and i wonder why |
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@liugangnhm We prefer to use the issue tracker for bug reports. Please ask questions on the golang-nuts mailing list, not on the issue tracker. Thanks. |
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all right,thanks. |
when an using exec.Cmd to fock an subprocess,with redirection like cat xxx > /tmp/xxxx ,it will always fail.
wheather /tmp/aaa is exist or not, error is always "exit status 1" .
file aaa is always exist.
when i set cmd's Stderr to bytes.Buffer ,and i see detail error:"cat: >d: no such file or directory". so i think go maybe treat '>' as a file name.
so how should i do when i want to use redirection symbol in command
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