perldiag

perl documentation file containing all diagnostic messages that Perl can produce

TLDR

View all Perl diagnostics

$ perldoc perldiag

Search for specific message

$ perldoc perldiag | grep "[error message]"

Use splain for explanations

$ perl [script.pl] 2>&1 | splain

Enable verbose warnings

$ perl -Mdiagnostics [script.pl]

SYNOPSIS

perldoc perldiag
splain [errormessage_]

perldiag is a Perl documentation file containing all diagnostic messages that Perl can produce. Each message includes explanation and suggested fixes.
Access via perldoc or use diagnostics module for runtime explanations.

Read full diagnostics

perldoc perldiag

Use diagnostics module in script

perl -Mdiagnostics script.pl

Explain error messages

echo "Use of uninitialized value" | splain

$
# IN SCRIPT

use diagnostics; # Verbose messages
use warnings; # Enable warnings

Or for specific categories

use warnings qw(all);
no warnings qw(uninitialized);

$
# MESSAGE TYPES

(W) Warning - may indicate problem
(D) Deprecation - feature being removed
(S) Severe warning - almost certainly wrong
(F) Fatal - compilation error
(X) Alien - error from external source

$
# CAVEATS

Part of core Perl documentation. diagnostics module adds runtime overhead. Use only during development.

# HISTORY

perldiag is part of **Perl** core documentation by **Larry Wall** and the Perl community.

# SEE ALSO

perl(1), perlre(1), splain(1), perldoc(1)