io.Copy(/dev/null, equivalent

[gocss]

like to dump stderr to bit bucket
io.Copy(/dev/null, stderr)

what is the equivalent for /dev/null in golang ?
or do I have write something to eat it ?

css

[Brad Fitzpatrick]

io.Copy(ioutil.Discard, yourReader)

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[Konstantin Khomoutov]

import "io/ioutil"
io.Copy(ioutil.Discard, stderr)

[Dave Cheney]

Stderr is where your program writes data to, so unless you are writing to stderr there is nothing to discard.

Are you using os/exec to call a sub process and wishing to discard that child's output?

[Rob Pike]

For the literal question being asked, there's always

os.Stderr = ioutil.Discard

but output to standard error includes important error messages, so this would make it much harder to understand what's happening if the program misbehaves.

In other words, here's how to do it but don't do it.

-rob

On Thu, Dec 24, 2015 at 9:13 AM, Dave Cheney <da...@cheney.net> wrote:

Stderr is where your program writes data to, so unless you are writing to stderr there is nothing to discard.

Are you using os/exec to call a sub process and wishing to discard that child's output?

[Brad Fitzpatrick]

On Thu, Dec 24, 2015 at 10:33 AM, Rob Pike <r...@golang.org> wrote:

For the literal question being asked, there's always

os.Stderr = ioutil.Discard

cannot use ioutil.Discard (type io.Writer) as type *os.File in assignment: need type assertion

Forget about your https://golang.org/issue/13473 already? :)

[Rob Pike]

I did indeed. I wished so hard for it to be fixed I'm already using it in my head.

-rob

[gocss]

yes calling a sub process and wishing to discard that child's stderr output [at least initially for testing]

[Dave Cheney]

If cmd.Stderr is nil, the output will be discarded. This is the default behaviour so you shouldn't have to do anything.