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Re: IPC::System::Simple: Why isn't my exception caught?

by stefbv (Curate)
on Nov 20, 2013 at 13:56 UTC ( [id://1063529]=note: print w/replies, xml ) Need Help??


in reply to IPC::System::Simple: Why isn't my exception caught?

There is no error because the exit value for "cat $file | wc -l" is 0 (zero).

Change the command to "wc -l file", as you say, and you get the error.

use IPC::System::Simple qw( capture $EXITVAL);
use strict;
use warnings;
use Try::Tiny;

my $file = 'foo';

my $result;
try {
    $result = capture("cat $file | wc -l");
}
catch {
    print "Error: $_";
};
print "Exitval is $EXITVAL";

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Re^2: IPC::System::Simple: Why isn't my exception caught?
by karlgoethebier (Abbot) on Nov 20, 2013 at 14:45 UTC

    D'oh! I should have known this.

    But surprisingly:

    user@SVN:/svn/dumps> cat foo
cat: foo: Datei oder Verzeichnis nicht gefunden
user@SVN-Prod1:/svn/dumps> echo $?
1
user@SVN:/svn/dumps> cat foo | wc -l
cat: foo: Datei oder Verzeichnis nicht gefunden
0

    [download]

    I admit, that i didn't ask efficiently.

    What i actually want to do is:

    qx(/usr/local/csvn/bin/svnadmin -q dump $repos | /usr/bin/gzip > $dump);

    Respectively:

    capture("/usr/local/csvn/bin/svnadmin -q dump $repos | /usr/bin/gzip > $dump");

    And i wanted to know (and trap the exceptions) if any part of my piped command fails.

    Some time ago i saw an example on PM that managed this using system and IPC::IPC::Open3. I didn't find the example yet.

    Thank you very much and best regards, Karl

    «The Crux of the Biscuit is the Apostrophe»

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