Basic Server Side Include Commands

config Sets the time, size, or error-message format.
echo Inserts the values of SSI variables into your Web page.
exec Executes a system command or a CGI program and inserts the output of that command into a Web page.
flastmod Inserts into your Web page the date of the last time a file was modified.
fsize Inserts the size of a file into your Web page.
include Inserts the contents of HTML files into your Web page.