Re^3: Can't close pipe to invalid process

Correct me if I'm wrong, but OP said:

Turns out it was because the PATH didn't exist in the Jenkins environment.
Why would the open succeed to an unknown executable?

As far as I understood OP, missing PATH meant that the script was unable to run executables except by full path:

$ env LC_ALL=C PATH="" /usr/bin/perl -E'open my $fh, "-|", $_ and say 
+"success" or say $! for "ls", "/bin/ls"'
No such file or directory
success
[download]

So the question was: how does open succeed despite inability to find the executable due to empty $PATH?

_{By the way, thanks for the spelling reminder.}

Comment on Re^3: Can't close pipe to invalid process Download Code

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Re^4: Can't close pipe to invalid process by BrowserUk (Patriarch) on Aug 29, 2015 at 19:59 UTC
The only path I see in the OP is that pointing to the file the executable is meant to process: `/opt/humana/svn/checkouts/rosalind-repo/prod/tmp/testfile.pdf` [download] The executable name is provided unadorned; so either in the current working directory or to be located via the path environment variable. But, as I've no knowledge of what the "Jenkins environment" is; it could be me misinterpreting the question. With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday' Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". I knew I was on the right track :) In the absence of evidence, opinion is indistinguishable from prejudice. I'm with torvalds on this Agile (and TDD) debunked I told'em LLVM was the way to go. But did they listen!	[reply] [d/l]
Re^5: Can't close pipe to invalid process by aitap (Curate) on Aug 31, 2015 at 12:34 UTC
I was talking about `prince`. Since (as OP found out) Jenkins had cleared PATH environment variable, and (supposedly) there was no `prince` executable in the current directory (or the script was running on a UNIX-like system where executables are not run from current directory unless `$PATH` contains `.`), OP thought that `open($fh, "\|-", "prince ...")` should have failed, but it didn't because there was a `$Config{sh}` between Perl and prince in the process tree.	[reply] [d/l] [select]