PHWinfo - Afficher un message - printf "hi\000"|egrep hi #why no STDERR output

22/04/2008, 18h35

In article <slrng0rv84.7t9.stephane.chazelas@spam.is.invalid> ,
Stephane CHAZELAS <this.address@is.invalid> wrote:
>2008-04-22, 14:44(+00), Kenny McCormack:
>[...]
>>>> ~ $ printf "hi\000"|egrep hi >foo
>>>> ~ $ cat foo
>>>> Binary file (standard input) matches
>>>> ~ $
>>>
>>>Maybe because it's not an error.
>>
>> And maybe the sun rises in the east.
>>
>> And yet you can see where he is coming from. In some sense, the term
>> "standard error" is a misnomer. It really is/should be "Out of Band".
>>
>> Really, the standard error channel should be used for any OOB type
>> information - that is, other than the actual, genuine output of the command.
>
>In which way isn't the "Binary file (..." message "actual,
>genuine output of grep"?

The answer to that is obvious. You may not agree with it, but feigning
ignorance is not going to win you any points.

>It seems to me that it carries information requested by the user (can
>"hi" be found in the standard input?).

I see where you're going with this - but the point is that if you are
looking for a yes/no answer, you should be using the return status of
grep as your indicator, not trying to parse the output.

22/04/2008, 18h35	#6
Kenny McCormack Messages: n/a Hébergeur:	Re: printf "hi\000"\|egrep hi #why no STDERR output In article <slrng0rv84.7t9.stephane.chazelas@spam.is.invalid> , Stephane CHAZELAS <this.address@is.invalid> wrote: >2008-04-22, 14:44(+00), Kenny McCormack: >[...] >>>> ~ $ printf "hi\000"\|egrep hi >foo >>>> ~ $ cat foo >>>> Binary file (standard input) matches >>>> ~ $ >>> >>>Maybe because it's not an error. >> >> And maybe the sun rises in the east. >> >> And yet you can see where he is coming from. In some sense, the term >> "standard error" is a misnomer. It really is/should be "Out of Band". >> >> Really, the standard error channel should be used for any OOB type >> information - that is, other than the actual, genuine output of the command. > >In which way isn't the "Binary file (..." message "actual, >genuine output of grep"? The answer to that is obvious. You may not agree with it, but feigning ignorance is not going to win you any points. >It seems to me that it carries information requested by the user (can >"hi" be found in the standard input?). I see where you're going with this - but the point is that if you are looking for a yes/no answer, you should be using the return status of grep as your indicator, not trying to parse the output.