======Builtin Variables======

The shell maintains several builtin variables which have special meaning.

	- HOME
		- Full path to the users home directory
	- PS1
		- Primary prompt.  Expands basic variables
	- PWD  (readonly)
		- Current Directory
	- PATH
		- Sequence variable of directories to search for external commands.
	- RANDOM
		- Read only variable that expands to random number from 0-32767
	- RANDOM32 
		- Read only variable that expands to random number from 0-4294967295
	- RANDOM64
		- Read only variable that expands to random number from 0-9223372036854775807  (only 63 bits to keep unsigned)
	- TMPDIR
		- System temporary directory
	- XMLSH
		- The xmlsh installation directory
	- XMODPATH
		- Sequence variable of directories to search for [[Modules xmlsh modules]]
	- XPATH
		- Sequence variable of directories to search for xmlsh commands.
	
====Startup====		
On startup the following variables are read from the system environment and treated specially.
	- PATH
		- The PATH variable is parsed using the system path seperator (";" on windows, ":" on unix) and a sequence variable PATH is created.   
	- XPATH	
		- The XPATH variable is parsed using the system path seperator (";" on windows, ":" on unix) and a sequence variable XPATH is created. 
	- HOME
		- If the HOME variable is set it is used to intialize the HOME variable, otherwise the java "user.home" property is used for HOME.
	- XMODPATH
		- The XMODPATH variable is parsed using the system path seperator (";" on windows, ":" on unix) and a sequence variable XMODPATH is created. 
	- XMLSH_SAXON_EE
		- If set then the value is treated as a boolean (true/false or 0/1) and used as the argument to "new Processor()".   This can be used to disable [[SaxonEE Saxon EE]] support even if the saxon9ee.jar and a valid saxon-license.lic file is found.
	- XLOGFILE
		- if **XLOGFILE** is specified then it is used as the log file.  See [[Logging]]
	- XDISABLE_LOGGING
		- if set and equal to "1" or "true" then logging is disabled.  See [[Logging]]
	- XLOG4JPATH 
		- if **XLOG4JPATH** is set it is used as the log4j configuration file.  See [[Logging]].  
	- XMLSHRC
		- if **XMLSHRC** is set and refers to an existing readable file it is read at startup and executed in the current shell

	
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See Also [[Variables]]
See Also [[SaxonSupport Saxon Support]]
See Also [[BasicSyntax Basic Syntax]]
See Also [[CoreSyntax Core Syntax]]
See Also [[Logging]]