Skip to Main Content
Perl in a Nutshell, 2nd Edition
book

Perl in a Nutshell, 2nd Edition

by Nathan Patwardhan, Ellen Siever, Stephen Spainhour
June 2002
Beginner content levelBeginner
759 pages
80h 42m
English
O'Reilly Media, Inc.
Content preview from Perl in a Nutshell, 2nd Edition

B::Lint

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:

all

Turns all warnings on.

context

Warns whenever an array is used in implicit scalar context.

dollar-underscore

Warns whenever $_ is explicitly used anywhere or whenever it is used as the implicit argument of a print statement.

implicit-read

Warns whenever an operation implicitly reads a Perl special variable.

implicit-write

Warns whenever an operation implicitly writes to a Perl special variable.

none

Turns off all warnings.

private-names

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., $_.

regexp-variables

Warns whenever one of the regular expression variables $', $&, or $' is used.

-u Package

Normally checks only the main program code and all subroutines defined in package main. -u lets you specify other packages to be checked.

undefined-subs ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Perl by Example, Fourth Edition

Perl by Example, Fourth Edition

Ellie Quigley
Perl Cookbook, 2nd Edition

Perl Cookbook, 2nd Edition

Tom Christiansen, Nathan Torkington
Perl in a Nutshell

Perl in a Nutshell

Nathan Patwardhan, Ellen Siever, Stephen Spainhour
Learning Perl, 7th Edition

Learning Perl, 7th Edition

Randal L. Schwartz, brian d foy, Tom Phoenix

Publisher Resources

ISBN: 0596002416Errata Page