Author: rchapin

Splitting a String in Bash on the FIRST Occurrence of a Character

Posted on by rchapin

About a year ago I posted an article about how to split into an array of values based on a given delimiter in bash.

The following is how to take that same string and split it on the first occurrence of the same user defined delimiter.

Both use the ‘read’ command, but in a slightly different way.

Instead of passing read the -a [aname] parameter which tells it that “The words are assigned to sequential indices of the array → Continue reading “Splitting a String in Bash on the FIRST Occurrence of a Character”

BASH Script With Default Arguments Defined in The Script

Posted on by rchapin

Often times you will want to write a BASH script where you don’t want to have to keep track of all of the positional command line arguments and/or you might want to configure it with a set of environmental variables while having a default value for each in the script.

Following is the syntax for declaring them in the shell script, and then an example on how to invoke it.

#!/bin/bash

: ${ARG1:="somedefault_arg1"}
: ${ARG2:="10"}

echo "ARG1 = $ARG1"
echo
→ Continue reading “BASH Script With Default Arguments Defined in The Script”

Unable to Set the Path To java.exe When Running Oracle SQL Developer Under Windows 7

Posted on by rchapin

I was trying to run Oracle SQL Developer for the first time on a new machine.  When firing it up, it presented me with a dialog box asking me to “Enter the full pathname for the java.exe file”.

OK, no problem.  So I find the path to the java.exe binary that was just installed with the SDK.  Hit submit . . . and nothing happens.  It blanks out the text field and the dialog box stares back at me.

I → Continue reading “Unable to Set the Path To java.exe When Running Oracle SQL Developer Under Windows 7”

Pin a “Show Desktop” Link to the Task Bar in Windows 7

Posted on by rchapin

To create a short cut and pin it to the task bar in Windows 7 do the following:

  1. Right-click on the Desktop and select New -> Shortcut.
  2. Enter the following in the field labeled “Type the location of the item:”  %windir%\explorer.exe shell:::{3080F90D-D7AD-11D9-BD98-0000947B0257}
  3. Click “Next” and name the shortcut and then click “Finish”.
  4. Update the icon so that you will recognize it when you pin it to the task bar.  To do so, right-click on the shortcut and select “Change Icon”
→ Continue reading “Pin a “Show Desktop” Link to the Task Bar in Windows 7”

Running Dynamically Generated Hive Queries From a Shell Script

Posted on by rchapin

If you want to write a HQL hive query and run it mulitple times from a shell script, each time passing it different data for the query, here is a quick example that should get you started.

The first thing to know is that by specifying n number of -hivevar key value pairs when invoking hive on the command line will allow you to pass that data into the hive process.

For example, if you do the following

$ hive
→ Continue reading “Running Dynamically Generated Hive Queries From a Shell Script”

Eclipse Android Development Error executing aapt: Cannot run program “/path/to/aapt”: error=2, No such file or directory: error=2, No such file or directory

Posted on by rchapin

Even though the ADT bundle provides a 64 bit version, the system requirements indicate that “64-bit distributions must be capable of running 32-bit applications.”  I failed to see that when installing it under Fedora Core 20 and was getting the following error from Eclipse:

Error executing aapt: Cannot run program "/home/rchapin/sdks/adt-bundle-linux-x86_64-20131030/sdk/build-tools/android-4.4/aapt": error=2, No such file or directory: error=2, No such file or directory  android_sdk    line 1   Android ADT Problem

I checked to see if the file was there.  Yep.  I → Continue reading “Eclipse Android Development Error executing aapt: Cannot run program “/path/to/aapt”: error=2, No such file or directory: error=2, No such file or directory”

Setting up Android in Eclipse, Unable to resolve target ‘android-18’

Posted on by rchapin

When setting up Eclipse for Android development, after you have installed the Develeper Tools and NDK Plugins and linked to the ADT-bundle and then imported your project (see othere posts related by searching for ‘android’) I got the following error:

[2014-03-24 14:14:53 - android_sdk] Unable to resolve target 'android-18'

I went and checked to make sure that the Platform.MinPlatformToolsRev property in the ~/path/to/adt-bundle-linux-x86_64-20131030/sdk/tools/source.properties matched that of my project.properties file.

They were both 18.  Eh?  Why the error?

So, in Eclipse, → Continue reading “Setting up Android in Eclipse, Unable to resolve target ‘android-18’”

Invalid Project Description, project path overlaps the location of another project with the same name When Importing Existing Android Project in Eclipse

Posted on by rchapin

I’ve got a new install of Eclipse and am setting up to do some Android development.

After getting the Develeper Tools and NDK Plugins installed and linking to the ADT-bundle that I downloaded, I was getting an error when attempting to import the existing project by going to File > Import > Android > Existing Android Code Into Workspace.

The error was:

Invalid project description /some/path/to/project/dir_name overlaps the location of another project: dir_name

After a few searches and a couple → Continue reading “Invalid Project Description, project path overlaps the location of another project with the same name When Importing Existing Android Project in Eclipse”

Restarting XServer in Fedora 20

Posted on by rchapin

I was having problems logging in this morning to my laptop.  When I entered my password, it just hung.   I pressed Ctrl-f2 to switch to an alternate tty, logged in as root and checked for errors in /var/log/messages.

Not seeing anything, I figured, I’d try and restart the Xserver.  Still not being completely familiar with the sysctl paradigm it wasn’t obvious how to restart it.

So, as root, I simply switched the runlevel to 3, and then back to 5 → Continue reading “Restarting XServer in Fedora 20”

© 2005 Ryan Chapin