Perl 5 with modern defaults

I saw developers taking other people's solutions for granted. Not thinking twice about the approach, not bothering about analyzing it. Ok, when this is Dan Abramov telling you how to use React or documentation saying that this is the only way to use its API, then yes, you probably should agree with it. Yet, when you're using some tech content without at least a bit of skepticism, then well, you still might go far in your career, but it also may hold you back.

Compiled by Peteris Krumins (peter@catonmat.net, @pkrumins on Twitter)
http://www.catonmat.net -- good coders code, great reuse

Latest version of this file is always at:

http://www.catonmat.net/download/perl1line.txt

This file is also available in other languages:

Chinese: https://github.com/vinian/perl1line.txt

Please email me peter@catonmat.net if you wish to translate it.

Perl One-Liners on Github:

https://github.com/pkrumins/perl1line.txt

You can send me pull requests over GitHub! I accept bug fixes,
new one-liners, translations and everything else related.

I have also written "Perl One-Liners Explained" ebook that's based on
this file. It explains all the one-liners here. Get it at:

http://www.catonmat.net/blog/perl-book/

No Starch Press has published "Perl One-Liners" as a real book too:

http://nostarch.com/perloneliners

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Slides of Tim Bunce's talk on Devel::NYTProf and optimizing perl code at YAPC::NA in June 2014. It covers use of NYTProf and outlines a multi-phase approach to optimizing your perl code.

A video of the talk and questions is available.

Kerberos is a network authentication protocol. It is designed to provide strong authentication for client/server applications by using secret-key cryptography. A free implementation of this protocol is available from the Massachusetts Institute of Technology. Kerberos is available in many commercial products as well.
The Internet is an insecure place. Many of the protocols used in the Internet do not provide any security. Tools to "sniff" passwords off of the network are in common use by malicious hackers. Thus, applications which send an unencrypted password over the network are extremely vulnerable. Worse yet, other client/server applications rely on the client program to be "honest" about the identity of the user who is using it. Other applications rely on the client to restrict its activities to those which it is allowed to do, with no other enforcement by the server.
Some sites attempt to use firewalls to solve their network security problems. Unfortunately, firewalls assume that "the bad guys" are on the outside, which is often a very bad assumption. Most of the really damaging incidents of computer crime are carried out by insiders. Firewalls also have a significant disadvantage in that they restrict how your users can use the Internet. (After all, firewalls are simply a less extreme example of the dictum that there is nothing more secure than a computer which is not connected to the network --- and powered off!) In many places, these restrictions are simply unrealistic and unacceptable.
Kerberos was created by MIT as a solution to these network security problems. The Kerberos protocol uses strong cryptography so that a client can prove its identity to a server (and vice versa) across an insecure network connection. After a client and server has used Kerberos to prove their identity, they can also encrypt all of their communications to assure privacy and data integrity as they go about their business.
Kerberos is freely available from MIT, under copyright permissions very similar those used for the BSD operating system and the X Window System. MIT provides Kerberos in source form so that anyone who wishes to use it may look over the code for themselves and assure themselves that the code is trustworthy. In addition, for those who prefer to rely on a professionally supported product, Kerberos is available as a product from many different vendors.
In summary, Kerberos is a solution to your network security problems. It provides the tools of authentication and strong cryptography over the network to help you secure your information systems across your entire enterprise. We hope you find Kerberos as useful as it has been to us. At MIT, Kerberos has been invaluable to our Information/Technology architecture.

FreeIPA is an integrated security information management solution combining Linux (Fedora), 389 Directory Server, MIT Kerberos, NTP, DNS, Dogtag (Certificate System). It consists of a web interface and command-line administration tools.

FreeIPA is an integrated Identity and Authentication solution for Linux/UNIX networked environments. A FreeIPA server provides centralized authentication, authorization and account information by storing data about user, groups, hosts and other objects necessary to manage the security aspects of a network of computers.
FreeIPA is built on top of well known Open Source components and standard protocols with a very strong focus on ease of management and automation of installation and configuration tasks.

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