TRACER is a command-line (also known as the terminal) environment.
To use TRACER you must ensure that you have version 8 of the Java Software Development Kit (JSDK). To check your Java version, open the terminal or command line and type:
ENTER. The resulting message should looks something like this:
java version "1.8.0_51"
If the second number in the sequence is lower than 8, a new JSDK Java package needs to be installed. Download the package for your operating system, install, restart the computer, open the terminal and re-type the command above. Your version should have changed to 8.
Apache Ant is a build system used to create an executable program. Among its many benefits, Ant allows to execute sequences of tasks from an XML file, typically called
build.xml. Apache Ant is used to compile TRACER’s source code into an executable program (see Execution of TRACER).
If you install TRACER on a Linux system, you can use package managers such as
apt-get to install Apache Ant. The benefit of using your system’s package manager is that new releases of Ant will be automatically installed when performing an update. To install Apache Ant with
apt-get type the following command:
sudo apt-get install ant
If your Linux distribution uses
dnf then type the following command:
sudo dnf install ant
If you're a Linux user, the installation instructions above should suffice in helping you run Apache Ant and you can therefore skip the rest of this section. If, however, you prefer to install Ant manually, then please read on.
Apache Ant is a regularly updated software. At the time of writing these guidelines (May 2017), the latest version of Ant is 1.10.1. The following instructions are based on this version. Please ensure your Ant version is always up-to-date. Navigate to the Apache Ant download page. There, the Current Release of Ant section lists different download options in archive formats. Select the
.zip format. For the Ant 1.10.1 version, select
bin substring in the file name indicates that a pre-compiled binary and executable Java program is included in this release of Ant. Please store this file in a dedicated folder on your machine, such as
/Users/johnsmith/Tools. If you want to make Apache Ant available for more than one user on your machine (e.g. make it accessible from a server), you should not install Ant in a personal home folder (e.g.
/Users/johnsmith) but in an openly accessible folder, such as
/opt/apache-ant. The instructions below are based on the installation of Ant in a personal folder.
The download file can be extracted by navigating to the download folder, right clicking the
apache-ant-1.10.1-bin.zip file and selecting
Extract. Alternatively, the extraction can be processed via the command line, which is much faster especially when you're unpacking large files. To do so, open a terminal and use the
cd command to change to your download folder. For example:
To unzip the file, type:
After unzipping the file, a new folder
apache-ant-1.10.1 is created. You can verify its existence by typing:
For Windows users (see Command line cheat-sheet) the command is not
ls -l but:
Under Mac OS X and Linux distributions, it is also necessary to set the access rights so that the program can be also executed. You can set the necessary rights by typing:
chmod -R 755 *
An environment variable is a key-value-pair to which all user- or system-wide programs have access. The Apache Ant software looks for the environment variable
ANT_HOME along with the folder in which Ant is installed. To reach the Ant home folder, in the command line type:
To visualise the path of Ant’s home folder, type:
This command stands for parent working directory and will show you the folder’s location on your computer (e.g.
/Users/johnsmith/Tools/apache-ant-1.10.1). You should now copy the path as you will need it in the next step.
In order to make the value or path available for the environment variable
which will take you to your personal home folder (i.e.
/Users/johnsmith/). In this folder, you should see a file called
.bash_profile; if not, create it by typing the following in the command line:
vim is a command line text editor and works equally on local and remote machines. To edit the file
.bash_profile press the
i button on your keyboard. When in
i (i.e. insert) mode, type:
and paste the path you copied earlier after the equal sign, like this:
To exit the
vim insert mode, press the
ESC button on your keyboard. To save the changes and close
w stands for write and
q stands for quit.
On Windows machines, setting the environment variable works a little differently. First, right click
My Computer, click
Properties and go to
Advanced system settings. Click now on the
Advanced tab. Click on
Environment Variables and then on
New ... . Insert
ANT_HOME as variable and
/Users/johnsmith/Tools/apache-ant-1.10.1 as its value.
Note 1: You can download and use different versions of Apache Ant at the same time by storing the unpacked files separately (e.g. in a folder called Tools, such as
/Users/johnsmith/Tools/). You can then define the version you want to use by typing the version number in the
ANT_HOME environment variable.
Note 2: The same principle applies to Java. You can store multiple versions of Java on your machine and define which version you wish to run in the
If you wish to double-check the value of a variable, type:
This command will list all environment variables with their respective values. To select only the
ANT_HOME variable, type:
export | grep ANT_HOME
The last step is to update the environment variable
PATH, which lists all directories of the file system that the computer should search for an executable program. The procedure is exactly the same as that described in the previous section. Linux and Mac OS X users should open the
.bash_profile file again and in the last line type:
This command makes the scripts in the
bin folder of
ANT_HOME available to the operating system to look for the
ant command. Windows users should follow the same procedure as that described in the previous section with the difference that the
PATH variable already exists and need only be edited. Another distinction is that in Mac OS X and Linux systems, different directories are separated by a colon, while in Windows systems by a semicolon. Furthermore, under Windows, the value of an environment variable is called with
%ANT_HOME%, whereas under Linux and Mac OS X it is
$ANT_HOME. The easiest way to add
ANT_HOME under Windows is to type:
at the end of the
PATH variable’s current value. In the command line, now type:
-v stands for version. This commands shows you the version of Ant you’re using and the build date of the program. The entry in the
.bash_profile file is important as it is now permanently available on your computer.
Install Sublime Text (free).