Making a career choice is difficult. And, if you have decided on becoming a programmer, the difficulty is just beginning. The most important thing is to first decide the language that you want to learn and this is often the most difficult decision. The good part is that you know you need to focus on learning programming and the bad part is that you might still be thinking which programming language should you begin to learn. » Read morevimtutor provides the best tutorial among those so far as I found on the Web while the vimtutor seems usually reachable from a terminal which is not obviously known to Vim beginners who are usually Linux beginners too. This page shows the content of the Vim tutorial from the command vimtutor in a web page which is especially easier for Vim beginners to get and learn. » Read more
$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 morecontent 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 moreinotify-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 moreposix_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 moregit 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 moregit submodule. For the list of full commands, check the git submodule manual. 
In the following commands, I take scala-mode2 as an example as the submodule.
Add a submodule ∞
git submodule init
git submodule status
git submodule add -f git@example.com/the-repo ./the-repo
Get submodules ∞
During clone ∞
git clone --recursive git@example.org:repo
In a cloned repository ∞
git submodule update --init --recursive
Check out the master and update submodules ∞
git submodule foreach --recursive git checkout master
git submodule foreach --recursive git pull
Push the version changes to origin ∞
# cd the git repository first (not in submodule)
git commit -am 'submodule updated'
git pushDelete a submodule ∞
git submodule deinit ./the-repo
git rm ./the-repo » Read more