Server-Side Include Directives
Command	Parameter	Description
echo	var	Inserts value of special SSI variables as well as other environment variables
include	<n/a>	Inserts text of document into current file
	file	Pathname relative to current directory
	virtual	Virtual path to a document on the server
fsize	file	Inserts the size of a specified file
flastmod	file	Inserts the last modification date and time for a specified file
exec	<n/a>	Executes external programs and inserts output in current document
	cmd	Any application on the host
	cgi	CGI program
config	<n/a>	Modifies various aspects of SSI
	errmsg	Default error message
	sizefmtt	Format for size of the file
	timefmt	Format for dates