less



less

NAME
SYNOPSIS
DESCRIPTION
FOR MODULE AUTHORS
CAVEATS

NAME

less − perl pragma to request less of something

SYNOPSIS

    use less 'CPU';

DESCRIPTION

This is a user-pragma. If you’re very lucky some code you’re using will know that you asked for less CPU usage or ram or fat or... we just can’t know. Consult your documentation on everything you’re currently using.

For general suggestions, try requesting "CPU" or "memory".

    use less 'memory';
    use less 'CPU';
    use less 'fat';

If you ask for nothing in particular, you’ll be asking for "less 'please'".

    use less 'please';

FOR MODULE AUTHORS

less has been in the core as a "joke" module for ages now and it hasn’t had any real way to communicating any information to anything. Thanks to Nicholas Clark we have user pragmas (see perlpragma) and now "less" can do something.

You can probably expect your users to be able to guess that they can request less CPU or memory or just "less" overall.

If the user didn’t specify anything, it’s interpreted as having used the "please" tag. It’s up to you to make this useful.

  # equivalent
  use less;
  use less 'please';

"BOOLEAN = less−>of( FEATURE )"
The class method "less−>of( NAME )" returns a boolean to tell you whether your user requested less of something.

   if ( less−>of( 'CPU' ) ) {
      ...
  }
    elsif ( less−>of( 'memory' ) ) {
  }

"FEATURES = less−>of()"
If you don’t ask for any feature, you get the list of features that the user requested you to be nice to. This has the nice side effect that if you don’t respect anything in particular then you can just ask for it and use it like a boolean.

   if ( less−>of ) {
      ...
  }
  else {
      ...
  }

CAVEATS

This probably does nothing.
This works only on 5.10+

At least it’s backwards compatible in not doing much.







Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.





Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.


Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.





Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.


Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.





Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.


Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.