Re: perl, open and pipe

What am I doing wrong here?I think the pipe is messing everything up.

No, the pipe is fine. Jusr redirect stderr (fileno 2) to stdout (fileno 1):

open(SY, "echo blablabla|/usr/bin/js 2>&1|") or die "$!";
while(<SY>){
    print ">>$_";
}
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Re^2: perl, open and pipe by afoken (Chancellor) on May 11, 2010 at 05:33 UTC
Depending on what /usr/bin/js does, that might be a bad idea. `2>&1` mixes STDERR and STDOUT into a single stream, so you may have a hard time "unmixing" them. If you need both STDOUT and STDERR, don't use `open "...2>&1 \|"`, but create two pipes manually or using IPC::Open3. If you need only STDOUT, use `open "... 2> /dev/null \|"`, if you need only STDERR, use `open "... 2>&1 > /dev/null \|"`. Alexander -- Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)	[reply] [d/l] [select]
Re^3: perl, open and pipe by shmem (Chancellor) on May 11, 2010 at 07:48 UTC
Since in the OP 'twas said I want to catch that error (or any result from the /usr/bin/js program). a single stream fits the task. Managing two file descriptors would be a YAGNI in that case.	[reply]