What are Environment Variables? Environment variables are global system variables accessible by all the processes running under the Operating System (OS). Environment variables are useful to store system-wide values such as the directories to search for the executable programs ( PATH) and the OS version. Examples of environment variables in Windows OS are: • COMPUTENAME, USERNAME: stores the computer and current user name.

In order to set PATH just add this JAVA_HOME/bin into PATH. These steps work in OS X version Lion, Mountain Lion, Mavericks, Yosemite, and even in beta version of latest Mac version OS X El Capitan. Don't forget to set JAVA_HOME using option -v if you have multiple Java version installed in your Macbook. JAVA_HOME is an Environment Variable set to the location of the Java directory on your computer. PATH is an internal DOS command that finds the /bin directory of the version of Java that you are using.

• OS: the operating system. • SystemRoot: the system root directory. • PATH: stores a list of directories for searching executable programs. In setting up JDK and Java applications, you will encounter these environment variables: PATH, CLASSPATH, JAVA_HOME and JRE_HOME.

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In short: • PATH: maintains a list of directories. The OS searches the PATH entries for executable programs, such as Java Compiler ( javac) and Java Runtime ( java).

• CLASSPATH: maintain a list of directories (containing many Java class files) and JAR file (a single-file archive of Java classes). The Java Compiler and Java Runtime searches the CLASSPATH entries for Java classes referenced in your program.

• JAVA_HOME and JRE_HOME: maintain the locations of JDK and JRE installed directory, respectively. (Windows) How to Set or Change an Environment Variable Variables in Windows are NOT case-sensitive (because the legacy DOS is not case-sensitive).

Environment variables are typically named in uppercase, with words joined with underscore ( _), e.g., JAVA_HOME. Display Variables and their Values To list all the variables and their values, start a CMD shell (Click 'Start' button ⇒ Run ⇒ Enter 'cmd') and issue the command ' set'. To display a particular variable, use command ' set varname'. For examples, // Display all the variables (in NAME=VALUE pairs) prompt> set COMPUTERNAME=xxxxxxx OS=xxxxxxx PATH=xxxxxxx.

// Display a particular variable prompt> set COMPUTERNAME COMPUTERNAME=xxxxxx // OR use echo command with variable enclosed within a pair of '%'s prompt> echo%COMPUTERNAME% COMPUTERNAME=xxxxxx Try issuing a set command on your system, and study the environment variables listed. Pay particular attention to the variable called PATH.

Set/Change/Unset a Variable To set (or change) a variable, use command ' set varname= value'. There shall be no spaces before and after the '=' sign. To unset an environment variable, use ' set varname=', i.e., set it to an empty string.