uncleflo
Registered since September 28th, 2017
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Lock your script (against parallel execution)
Saved by uncleflo on February 8th, 2017.
Sometimes there's a need to ensure only one copy of a script runs, i.e prevent two or more copies running simultaneously. Imagine an important cronjob doing something very important, which will fail or corrupt data if two copies of the called program were to run at the same time. To prevent this, a form of MUTEX (mutual exclusion) lock is needed. The basic procedure is simple: The script checks if a specific condition (locking) is present at startup, if yes, it's locked - the scipt doesn't start. This article describes locking with common UNIX® tools. There are other special locking tools available, But they're not standardized, or worse yet, you can't be sure they're present when you want to run your scripts. A tool designed for specifically for this purpose does the job much better than general purpose code.
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Shell Scripting Tutorial - Quick Reference
Saved by uncleflo on October 28th, 2016.
A Bourne Shell Programming / Scripting Tutorial for learning about using the Unix shell. Learn Linux / Unix shell scripting by example along with the theory. I'll have you mastering Unix shell scripting in no time.
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Advanced Bash-Scripting Guide
Saved by uncleflo on October 28th, 2016.
This tutorial assumes no previous knowledge of scripting or programming, yet progresses rapidly toward an intermediate/advanced level of instruction... all the while sneaking in little nuggets of UNIX® wisdom and lore. It serves as a textbook, a manual for self-study, and as a reference and source of knowledge on shell scripting techniques. The exercises and heavily-commented examples invite active reader participation, under the premise that the only way to really learn scripting is to write scripts. This book is suitable for classroom use as a general introduction to programming concepts. This document is herewith granted to the Public Domain. No copyright!
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Bash Guide for Beginners
Saved by uncleflo on October 28th, 2016.
The primary reason for writing this document is that a lot of readers feel the existing HOWTO to be too short and incomplete, while the Bash Scripting guide is too much of a reference work. There is nothing in between these two extremes. I also wrote this guide on the general principal that not enough free basic courses are available, though they should be. This is a practical guide which, while not always being too serious, tries to give real-life instead of theoretical examples. I partly wrote it because I don't get excited with stripped down and over-simplified examples written by people who know what they are talking about, showing some really cool Bash feature so much out of its context that you cannot ever use it in practical circumstances. You can read that sort of stuff after finishing this book, which contains exercises and examples that will help you survive in the real world. From my experience as UNIX/Linux user, system administrator and trainer, I know that people can have years of daily interaction with their systems, without having the slightest knowledge of task automation. Thus they often think that UNIX is not userfriendly, and even worse, they get the impression that it is slow and old-fashioned. This problem is another one that can be remedied by this guide.
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