Principal Software Engineer/Architect, motorcyclist, drummer, and artist
If you have a long-running command on shell-script that you want to generate a beep upon completion on your PC running Linux do the following:
Make sure that the pcspkr module is loaded:
# modprobe pcspkrThen create a wrapper shell script that looks something like this:
#!/bin/bash
# Some long running command here . . .
echo -e '\a' /dev/consoleI’m setting up a new workstation under Fedora Core 20 and getting my dev environment set up.
I had copied over my /opt dir from my old machine which included an older version of Eclipse (3.8.2) that I had been using. That version wasn’t behaving very well and I decided to go with the latest and greatest stable version (Kepler, 4.3.1).
Unfortunately, Kepler was dumping core with the following error:
A fatal error has been detected by the Java Runtime → Continue reading “Eclipse Crashing with SIGSEGV, Problematic Frame libgdk and/or libsoup Problem Solved”
I am doing some refactoring on a Spring MVC application, pulling out configuration data and login crentials from the spring.xml file.
What I want to do is to consolodate sensitive data into external .properties files that can be read, at runtime by the app and not require recompiling the war to make changes.
Thanks to Ben Northrop and Summa Technologies for such a clear, concise and well written article.
The long and the short of it (copied from the → Continue reading “Excellent Example and Explanation on How to Inject Properties from an External Properties File from Outside of a WAR in a Spring Application”
For me, window snapping is incredibly annoying.
For FC 20 with the Xfce spin, there a couple of knobs to turn before it can be turned off completely:
Applications Menu/Settings/Window Manager:
Go to the Advanced tab and uncheck ‘Snap windows to screen border’ and ‘Snap windows to other windows’
Applications Menu/Settings/Window Manager Tweaks:
Go to Accessibility tabUncheck the ‘Use edge resistance instead of window snapping’→ Continue reading “Disabling Window Snapping for Fedora Core 20 Under Xfce”
If you would like to, in a shell script, dynamically generate SQL queries for MySQL and save the output of those queries to a variable that you can then use in the script, here is an example:
#!/bin/bash
for i in `cat tables_list.txt`
do
# Build the query
QUERY="SELECT count(*) FROM ${i}"
# Run the query from the command-line and save the
# output into the $ROW_COUNT variable
ROW_COUNT=$(echo $QUERY | mysql -u${USER_NAME} -p${PASSWORD} -h ${HOST} -P ${PORT} --skip-column-names ${DBASE})
Following is how to dynamically append (push) items to an array in a bash script.
declare -a ARRAY=()
ARRAY=("${ARRAY[@]}" "item1")
ARRAY=("${ARRAY[@]}" "item2")When developing apps you will not only want to test them against the Eclipse AVDs but also install them on an actual device.
To do so, set up an HTTP server (here is a link to another article on how to set up a quick and dirty HTTP server) and put you .apk file somewhere where you can get to it from your local network.
Make sure that you check the ‘Unknown sources’ setting that will enable you to → Continue reading “Install Android Application Directly Without it Being in the Market”
If you are doing any kind of development that involves cookies and need to be able to delete them while testing iOS you will likely need to delete them as well.
The iOS simulator (Launched from Xcode by going to Xcode > Open Developer Tool > iOS Simulator) stores data for the simulator in the following directory on the host Mac OSX file system: /Users/<uid>/Library/Application Support/iPhone Simulator/
First, quit out of the iOS Simulator.
To find the cookies and delete → Continue reading “Deleting Safari Cookies in iOS Simulator”
Following is how to generate dynamic SQL in a shell script and then execute those queries.
Let’s say, for instance, that you have a list of tables that you want to flush regularly during development and don’t want to type in the SQL queries each time. Moreover, you just want to maintain a list of the table names and add and remove from it when necessary and have your script dynamically generate and execute the delete statements.
For the purposes → Continue reading “Executing Dynamically Generated SQL Queries from a Shell Script”
To set up an existing install of Eclipse to do some Android development do the following: