Portable Shell – Autoconf – When writing your own checks, there are some shell-script programming techniques you should avoid in order to make your code portable. The Bourne shell and upward-compatible shells like the Korn shell and Bash have evolved over the years, and many features added to the original System7 shell are now supported on all interesting porting targets.
ZetCode, tutorials for programmers – ZetCode brings tutorials for programmers in various areas. The main are Graphics User Interface, databases and programming languages. The website's mission is to provide competent, quick and easy to understand tutorials for modern-day technologies.
These are my links for 29 nov 2012 from 15:24 to 16:55:
PowerShell Commands (CMDLETs) for Active Directory by Quest – The ActiveRoles Management Shell for Active Directory is a set of free, predefined commands for Windows PowerShell, the powerful command line and scripting language developed by Microsoft. These commands are designed to help administrators automate common, repetitive and bulk management tasks for Active Directory, such as creating, removing or updating objects in AD.
ksh_timer – An interface to evaluate function execution time in shell script in each function or in user-defined sections
Summary: ksh_timer helps ksh script developers or administrators to find out quickly and with minimal change in their script, what functions or user-defined sections are time consuming. By default, ksh_timer will time the overall script and each function defined and used in the script. Users can define additional sections of the scripts they need to be timed.
These are my links for 25 lug 2012 from 14:52 to 15:47:
Disaster: LVM Performance in Snapshot Mode – MySQL Performance Blog – In many cases I speculate how things should work based on what they do and in number of cases this lead me forming too good impression about technology and when running in completely unanticipated bug or performance bottleneck. This is exactly the case with LVM
Number of customers have reported the LVM gives very high penalty when snapshots are enabled (leave along if you try to run backup at this time) and so I decided to look into it.
Netexpertise » Mysql Ultra-Fast Backup with LVM – It is generally good practice to respect the two following points when backing up databases. The backup has to be:
Consistency is easily achieved putting a read lock on all tables beforehands. However, this isn’t always applied, and WILL definately lead to a database integrity problem at some stage.
Once a lock has been set on the database, the backup has to be as quick as possible, all write instructions being held in the queue.