**Remember: Properties are immutable: whoever sets a property first freezes it for the rest of the build; they are most definately not variable.**


^ Property     ^ Description     ^
| basedir | the absolute path of the project's basedir (as set with the basedir attribute of <project>). |
| ant.file | the absolute path of the buildfile. |
| ant.home | home directory of Ant |
| ant.java.version | the JVM version Ant detected; currently it can hold the values "1.2", "1.3", "1.4" and "1.5". |
| ant.project.name | the name of the project that is currently executing; it is set in the name attribute of <project>. |
| ant.version | the version of Ant |
| java.class.version | Java class format version number |
| java.class.path | Java class path |
| java.ext.dirs | Path of extension directory or directories |
| java.home | Java installation directory |
| java.specification.name | JRE specification name |
| java.specification.vendor | JRE specification vendor |
| java.specification.version | JRE specification version |
| java.vendor | JRE vendor |
| java.vendor.url | Java vendor URL |
| java.version | JRE version |
| java.vm.name | JVM implementation name |
| java.vm.specification.name | JVM specification name |
| java.vm.specification.vendor | JVM specification vendor |
| java.vm.specification.version | JVM specification version |
| java.vm.vendor | JVM implementation vendor |
| java.vm.version | JVM implementation version |
| os.arch | Operating system architecture |
| os.name | Operating system name |
| os.version | Operating system version |
| file.separator | File separator ("/" on UNIX) |
| line.separator | Line separator ("\n" on UNIX) |
| path.separator | Path separator (":" on UNIX) |
| user.dir | User's current working directory |
| user.home | User's home directory |
| user.name | User's account name |

==== System Environment Properties ====
Your system environment variables are also available as Ant properties:
<code>
<property environment="env"/>
</code>

<code>
<echo>Hostname: ${env.COMPUTERNAME}</echo>
<echo>Path: ${env.PATH}</echo>
</code>