Principal Software Engineer/Architect, motorcyclist, drummer, and artist
Let’s say that all that you have access to is the command line on a Linux box and you want to know what the network throughput is. If you have another Linux box you can use netcat to do a quick test:
On box a:? Set up netcat to listen to a given port:
nc -l 12345 > /dev/null
Fire up netcat to listen on port 12345 and to dump the output to /dev/null.
On box b:? Send data via → Continue reading “Simple Network Speed Command Line Test for Linux”
?When I first set up a developoment VM with CentOS I must have forgotten to install the Java source because I could not navigate to Java SE method declarations in my Eclipse IDE.
To have access to the Java source I did the following:
I created a src dir in the aforementioned containing dir and unpacked the zip
I then linked to the source from Eclipse by:
Right-clicking on some → Continue reading “Installing Java SE Source Files and Linking to Eclipse on CentOS 5”
When I then ran through the Eclipse add server wizard the 6.0 version of JBoss AS was available.→ Continue reading “Installing JBoss AS 6 Tools in Eclipse Helios”
By default, the newer versions of Eclipse do not include the libraries that you add to the build path in .war files. There are three approaches to solving this problem:
In some cases it is helpful to have your Java project automatically built and deployed for you by Eclipse. For me, when working on a dynamic web or JavaEE project I’d much rather run it on the server through the IDE manually, as I tend to save often and I end up having to wait for a previous deployment to finish on a regular basis.
To disable the feature:
A couple of links with lists of the default set of Linux daemons installed on most systems. Helpful to know which ones that you need to disable when locking down a machine.
http://www.hscripts.com/tutorials/linux-services/index.php→ Continue reading “Linux Daemons and Services List”
In a small bowl, beat egg slightly; set aside. Bring chicken broth to a boil over high heat. Add corn starch mixture to the broth stirring until it comes to a boil again. Reduce heat to medium-low. Hold the pan with beaten egg about 12 to 15″ above the → Continue reading “Egg Drop Soup”
Sometimes you will accidentally create a file that has special characters in the file name which then prevents you from running commands on it. In that case, you can resort to accessing the file via it’s inode number.
To do so:
$ ls -il | more
In the directory in which the file that you want to examine resides
This will output a list of files, the first column being the inode number.
You can then run the following command → Continue reading “Deleting a File Using the Inode Number”
The following is an example of how to run a query on the command line to output the result of a MySQL query to a CSV file.
Create a text file with the your query, query.sql:
SELECT * FROM hosts;
The run the following command:
mysql –skip-column-names -uuser -ppassword database < query.sql | sed ‘s/\t/”,”/g;s/^/”/;s/$/”/;’ > filename.csv
This will run the MySQL query and output the results to a text file in .csv format.
The sed commands do the following:→ Continue reading “Retuning a MySQL Query in CSV”
Let’s say that you have deleted a file (or directory) in your checked out copy of a svn repository and then checked it in (committed your change).
You discover that you really would like to have that file back in your current version of your repo. You can either us the svn merge command, or copy the file from a previous version of your repo.
Here is how you can copy the file from a previous version:
svn rm blah.txt→ Continue reading “Retrieving a Previously Deleted File in Subversion”