Provides program checking for Perl programs. Equivalent to running Perl with the -w option. Named after the Unix lint program for checking C programs. Invoked as:
perl -MO=Lint[,options
]program
program
is the name of the Perl
program that will be checked. The options are separated by commas and
follow normal backend option conventions. Most of the options are
lint-check options, in which each option is a
word specifying one lint check. Preceding an
option with no-
turns off that
option. Options specified later override earlier options. There is
also one non-lint-check option, -u. Here is the
list of available options:
Turns all warnings on.
Warns whenever an array is used in implicit scalar context.
Warns whenever $_
is
explicitly used anywhere or whenever it is used as the implicit
argument of a print
statement.
Warns whenever an operation implicitly reads a Perl special variable.
Warns whenever an operation implicitly writes to a Perl special variable.
Turns off all warnings.
Warns whenever any variable, subroutine, or method name
lives in a non-current package but begins with an underscore (
_
). Doesn’t warn about an
underscore as a single-character name, e.g., $_
.
Warns whenever one of the regular expression variables
$'
, $&
, or $'
is used.
Normally checks only the main program code and all
subroutines defined in package main
. -u lets you
specify other packages to be checked.
Warns whenever an undefined subroutine is invoked.
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