You can get a more customizable effect via %SIG handlers. A quick proof-of-concept:

use IO::Handle;
my $filename = "/etc/passwd";
open my $fh, '<', $filename or die $!;
my $customerr = sub {
    my $msg = shift;
    $msg =~ s/\.?\s*$//;
    return "$msg ($filename line ".$fh->input_line_number.")\n";
};
local $SIG{__WARN__} = sub { warn $customerr->(shift) };
local $SIG{__DIE__} = sub { die $customerr->(shift) };
while (<$fh>) {
    warn "BEEP!" if /root/;
    die "ACK!" if /nobody/;
}
close $fh;
__END__
BEEP! at - line 12, <$fh> line 1 (/etc/passwd line 1)
ACK! at - line 13, <$fh> line 7 (/etc/passwd line 7)

[download]

It may be a little more work than using Perl's built-in mechanisms, but it works great in other cases too - for example if you're going over the rows of a spreadsheet, you can include the row number in the error message.

In reply to Re: Here there be cammels! by Anonymous Monk
in thread Here there be cammels! by hildred

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.