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1. Visit the download page and download the "Complete ANTLR x.y Java binaries jar" file.
   • For example, from a Linux shell, download ANTLR 3.3 to your home directory:

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     cd ~ wget http://www.antlr.org/download/antlr-3.3-complete.jar

2. Add ANTLR to your CLASSPATH environmental variable and run it:

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   export CLASSPATH=~/antlr-3.3-complete.jar:$CLASSPATH java org.antlr.Tool -version

   Expect output like the following:

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   ANTLR Parser Generator Version 3.3 Nov 30, 2010 12:50:56

   If you see output like the following, the CLASSPATH is not set up properly:

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   Exception in thread "main" java.lang.NoClassDefFoundError

   If you see an older version of ANTLR, your CLASSPATH may not be set up properly and Java may be finding ANTLR in .jar files from bundled with an application like BEA WebLogic. Ensure the path to the current .jar of ANTLR is at the beginning of your CLASSPATH.
3. Configure your CLASSPATH to include ANTLR on future logins.
   • For example, on a BASH shell, add the environmental variable to the .bashrc script:

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     echo "export CLASSPATH=~/antlr-3.3-complete.jar:$CLASSPATH" >> ~/.bashrc