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Search results for Arcane Linux Commands: dc

Unix+clones

Arcane Linux Commands: dc

Post date: September 26, 2007, 09:09 Category: Software Views: 3303 Comments
Tutorial quote: A beginner-friendly guide to dc, the Unix command-line calculator. Answers many questions that the man page doesn't.
Linux

Linux Commands Line

Post date: January 5, 2008, 22:01 Category: Miscellaneous Views: 4039 Comments
Tutorial quote: Complete and updated list of commands on Linux - over 350 commands divided into arguments!
Linux

Basic Linux Commands With Man Pages

Post date: October 11, 2006, 16:10 Category: Installing Views: 2936 Comments
Tutorial quote: Here are some basic commands to get you started in the wonderful world of Linux and other UNIX variants. All of these commands should work from your command prompt (regardless which shell you’re using).
Linux

Linux Shortcuts and Commands

Post date: December 12, 2005, 18:12 Category: System Views: 2510 Comments
Tutorial quote: This is a practical selection of the commands and shortcuts we use most often. Handy linux commands source. Good stuff, many of these a lot of people already know but it is a great memory tool.
Unix+clones

Linux Commands I Hardly Knew

Post date: June 29, 2008, 18:06 Category: Miscellaneous Views: 5283 Comments
Tutorial quote: Some interesting and rarely used commands for *nix based OS systems.
Linux

First Steps Of Running Linux Via Terminal Instead Of Desktop

Post date: August 8, 2011, 07:08 Category: Miscellaneous Views: 3143 Comments
Tutorial quote: This tutorial is supposed to show new Linux users how to handle Linux without having to browse through your desktop to edit files. The core commands to do this are the same on every Linux distribution, however there is a large variety of commands that differ from distribution to distribution, as does the install command.
Linux

Translating DOS to Linux

Post date: September 29, 2005, 17:09 Category: Miscellaneous Views: 2534 Comments
Tutorial quote: So you know DOS. You're used to it, and it makes you feel warm and fuzzy. Snap out of it. This page is a list of Linux commands and they're DOS cousins, so you can feel more comfortable navigating in the Linux world, though you might have already known some of these commands if you've ever used an FTP client.
Linux

Arcane Linux Commands: dc

Post date: December 31, 2007, 01:12 Category: Miscellaneous Views: 3428 Comments
Tutorial quote: If anybody within earshot of you is struggling to learn sed and ever remarks "This is like learning Klingon! Could they make it any more cryptic?", you can always point them to dc.

dc is the command-line Unix "Reverse-Polish Notation"(RPN) calculator. The name stands for "desktop calculator". OK, so what is a Polish calculator and why would you want to reverse one? The math that you do in school uses infix notation, with the operator between the numbers (3 + 5). Prefix notation puts the operator first (+ 3 5) and is what the Lisp language uses. The prefix notation is known as "Polish notation" after the nationality of Jan Łukasiewicz who invented it. Postfix notation, then, has the operator at the rear (3 5 +), and so is also the reverse of Polish notation.

What's the difference? In computer programming, you have to specify what order you want a multi-part calculation to be in. Everybody is familiar with the old problem of A*B-C. For A=5, B=3, C=2, multiplying first and subtracting second gives you 13, while subtracting first and multiplying second gives you 5. To specify which operations you want performed first, you have to either memorize the complex orders of operations (which change from one language to the next) or use a lot of parenthesis ((A*B)-C) or (A*(B-C)). Hey, that's what everybody complains about in all those languages that use parenthesis!
Debian

Triggering Commands On File/Directory Changes With Incron

Post date: September 2, 2008, 09:09 Category: Miscellaneous Views: 3440 Comments
Tutorial quote: This guide shows how you can install and use incron on a Debian Etch system. Incron is similar to cron, but instead of running commands based on time, it can trigger commands when file or directory events occur (e.g. a file modification, changes of permissions, etc.).
Linux

How To Utilize Your New Multimedia Keyboard Under Linux

Post date: April 28, 2007, 22:04 Category: Desktop Views: 2836 Comments
Tutorial quote: Xbindkeys is a program that allows you to launch shell commands with your keyboard or your mouse under X Window. It links commands to keys or mouse buttons, using its configuration file. It does not depend on the window manager and can capture all keyboard keys.
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