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Tutorials and tips on programming related to Linux systems, Web and more.
Filter Salutation in Microsoft Dynamics CRM
Dynamics CRM Consultants Explain How To Filter Sub Branch Lookup Field Value in CRM
In this blog Dynamics CRM consultants are sharing a step-by-step guide to explain how to filter another lookup field value based on one Lookup field value. In this Lead entity, they are having two fields Branch and Sub Branch and you will learn how they filter Subbranch based on Branch field.
Based on one Lookup field value, how to filter another lookup field value. » Read more
Push and Pull data from Restful Service in Asp.net MVC Application using Angular JS
In this post, asp.net development India based professionals will explain the best way to manage the Restful service using AngularJS. They are explaining the push and pull functionality available in Rest service in simple steps. Read the article to know more.
In this Post I am going explain how we can manage the Restful service using AngularJS. Push and Pull functionality of Rest service Json data in MVC View in easy steps. » Read more
Parameterised AngularJS Routing in Asp.net MVC using $routeProvider
In this post, asp.net development India based professionals will brief you about the interesting feature of AngularJS, that I Routing. You will learn the method to split the single page into multiple views. For more info, read the article. In this article we are going to see one of the most useful feature of AngularJS called routing.
I am going to explain how we can split the single page into multiple views though ng-View and each views will be loaded by using the routing logic. » Read more
Quartz Implementation in Java
In this post, java development India based experts will explain the concept of Quartz. You will also learn the method of setting up the Quartz in this article. You can ask experts if anything bothers you.Table of Contents [hide]1 Technology 2 Some of the Features of Quartz 3 Quartz setup 4 Key classes in Quartz 5 Quartz Scheduler Examples5.1 Creating Scheduler object: 5.2 Creating jobs: 5.3 Creating JobDetail object 5.4 Creating triggers 5.5 Triggering the scheduler: 5.6 Stopping Scheduler 5.7 Exception Handling 5.8 Concurrent Execution of Jobs 5.9 Triggers 5.10 Scheduler Listeners6 ConclusionTechnology ∞
Quartz is the open source Java technology for scheduling background jobs. » Read more
How to Get Bash Script’s Own Path
Bash script may need to get its own path. In normal Bash script,
$0 is the path to the script. However, when a script is sourced, such as . a.sh, a.sh‘s $0 does not give a.sh while the caller’s name. How to reliably get a bash script’s own path no matter whether the Bash script is executed or sourced is introduced in this post. » Read moreNotes for Beginners of Software Development on Linux
Linux is a great platform for software development targeting servers or backends. In general, working on Linux is very productive. The problem that beginners on Linux face is the the learning curve is steep at the beginning. But believe me, after you get through the initial green steep learning step as in the figure below with some hard work, you will feel like working on a rocket in the yellow part. » Read more
Tutorial Video for “PHP Function for Fetching RSS Feed and Outputting Feed Items as HTML”
After the post A PHP Function for Fetching RSS Feed and Outputing Feed Items as HTML was originally published, there are some updates such as adding a simple RSS feed caching mechanism and supporting scanning
content parts of the feed items for images. Recently, Webucator makes a great tutorial video on introducing the RSS to HTML PHP function. Here is the video that teaches how to use the PHP function. » Read moreRunning a Command Upon Files or Directories Changes on Linux
Doing actions upon changes of files and directories is very useful. Examples like compiling a project after the source code files are changed, sending emails after important configuration files are modified, building the PDF after a TeX file is modified. On Linux, the
inotify-tools provide good support for trigger actions after changes. In this post, I will introduce a small tool do-after-change.sh which continuously runs a command upon certain files and directories change. » Read moreHow to Get Available Filesystem Space on Linux: a C Function with a C++ Example
It is common for programs to write to files in filesystems on disks. However, what if the disk was almost full when your program writes to the filesystem on a disk? For systems software and mission critical programs, it is a better or must-to-do practice to check the available filesystem space before actually writing to files. On POSIX OSes, we have the
statvfs POSIX API to get filesystem statistics (On Linux, you may use the Linux specific statfs, but POSIX APIs are better for portability). » Read moreProfiling Vim to Find Out Which Plugin Makes Vim Slow
Vim is pretty fast and powerful. However, the core of Vim is (yet) single-threaded (some discussions and tries on porting Vim to be multi-threading, but not yet there). This means some functions that are slow will block Vim there and you have to wait for it. While Vim is fast, some plugins are not. When Vim turns to be slow, it is very likely caused by one or more plugins. » Read more
A PHP Function for Fetching RSS Feed and Outputing Feed Items as HTML
I aggregated all my new posts from several sites into a single RSS feed. Last time I updated my homepage, I came across an idea why not showing these feed items directly on the homepage as HTML content. After some study, I got one single PHP function in my hand that fetches an RSS feed and outputs HTML content in the page. » Read more
A posix_spawn Example in C to Create Child Process on Linux
The
posix_spawn() and posix_spawnp() functions create a new child process from the specified process image constructed from a regular executable file. It can be used to replace the relative complex “fork-exec-wait” methods with fork() and exec(). However, compared to fork() and exec(), posix_spawn() is less introduced if you search on the Web. The posix_spawn() manual provides details. However, it is still not sufficient especially for beginners. » Read moreKeyboard Key Mapping for Emacs: Evil Mode and Rearranging Alt, Ctrl and Win Keys
Ctrl keys are important and possibly most frequently used in Emacs. However, it is painful on today’s common PC keyboards since Ctrl keys are usually in the corner of the keyboard main area. Why the key mappings in Emacs are designed like this? After it was designed, Emacs was commonly on the Lisp Machine keyboards with Ctrl keys closer to the space bar as show below (src). » Read more
Git Merging FAQs
git merge is frequently used during development of projects managed by git. There are many common questions about git merge and I find most are solved and discussed on StackOverflow. Here, I summarize useful ones so that others who want to learn git merge need to do the search again.
Merge, rebase, fast forward and conflicts ∞Differences between git rebase and git merge. » Read moreCheatsheet: Git Branching with a Git Server
It is common to set up git servers to host git repositories. Branching is lightweight in git and a very friendly mechanism to manage code. Here, I summarize a cheatsheet of common git branching commands for working on repositories from a git server. This post assumes that you have basic knowledge with git. If you are not familiar with git, you may want check Howto for New Git Users first. » Read more
How to Catch the Signal Sent by Kill in C on Linux
Programs may want to catch the kill signals sent by the
kill command in C programs on Linux so that it can gracefully shutdown itself before it is killed. For example, I have a daemon progd running, and it may be killed by pkill progd. The progd may want to save some in-memory state to disks because otherwise that data will be lost. » Read moreGit through SSH Tunnel as Proxy
git is a great tool and it is common to have a git server over SSH possibly managed by gitolite. However, there are situations that we can not directly connect to the git server but be able to SSH to another node that can connect to the git server. The git server may allow only internal connections because of security. With the node that we can SSH to, we can still use the git server “directly” by setting up a SSH tunnel as a proxy for the git connection. » Read more
Vim Howtos and Tips
Vim is a fast and handy editor on *nix systems. Like Emacs, Vim has a steep learning curve as you get constantly get new things. However, the effort deserves it as you efficiency is highly improved. Here, I summarize the tips and howtos I learned using Vim. Some previous posts on vim are tagged with vim.Table of Contents [hide]1 My .vimrc and .vim file1.1 How to use these files2 Previous posts tagged vim 3 Latex Writing in Vim with the Help of vim-latex3.1 master file 3.2 List references to sections, figure and tables to insert 3.3 List citations from the bibtex file to insertMy .vimrc and .vim file ∞
My .vimrc and .vim files:
https://github.com/zma/vim-config
How to use these files ∞
cd /path/to/vim-config/
git submodule update --init
If you never configured Vim:
cd
ln -s /path/to/vim-config/.vimrc ./
ln -s /path/to/vim-config/.vim ./
If you ever configured your Vim, you may need to merge my configurations to yours. » Read more
