perl -MO=Lint[,options] program
programis the name of the Perl program to be checked. The options are separated by commas and follow normal backend option conventions. Most of the options are lint-check options, where 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.
$_ is explicitly used anywhere or whenever it is used
as the implicit argument of a
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
$` is used.
Normally checks only the main program code and all subroutines defined in
main; -u lets you specify other packages to be checked.
Warns whenever an undefined subroutine is invoked.