Printing Environment Variables with echo

echo
Echo prints the value of one of the environment variables.

DOCUMENT_NAME - Prints the file name of the current document.

<!--#echo var="DOCUMENT_NAME" -->

displays as:
index.html

DOCUMENT_URI - Prints the virtual path to the current document.

<!--#echo var="DOCUMENT_URI" -->

displays:
/YourDirectory/YourFilename.html

Ever go crazy trying to copy the "big guys" and have the full URL of your pages displayed on each and every page in your site? You won't last long if you're hardcoding this information; do it with an include and simplify your life! Precede the include with your domain name to display the full URL of any page.

http://YourDomain<!--#echo var="DOCUMENT_URI" -->

QUERY_STRING_UNESCAPED - The unescaped version of any search query the client sent, with all shell-special characters escaped with \.

<!--#echo var="QUERY_STRING_UNESCAPED" -->

DATE LOCAL - Dates and times are subject to the server timezone unless you've configured your server to show a different timezone. Default output of DATE_LOCAL is fairly blah, ranging to ugly but the good news is you're not stuck with the default output. By combining the variable with config timefmt you can specify almost any output you please.

Consider the following two examples. The first is the default output of DATE_LOCAL.

<!--#echo var="DATE_LOCAL" -->

displays as:
Saturday, 15-Apr-2000 12:24:42 MDT

Not exactly what you wanted, so let's customize it a bit. The example below uses the config directive to specify a more pleasing output. Text is added to the include giving us a line that flows like a sentence rather than just sticking the information up there for the world to see.

<!--#config timefmt="%A, the  %d of  %B, in the year  %Y" -->
<!--#echo var="DATE_LOCAL" -->

displays as:
Saturday, the 15 of April, in the year 2000 

DATE_GMT - DATE_GMT works the same as DATE_LOCAL, except that it returns Greenwich Mean Time.

<!--#echo var="DATE_GMT" -->

LAST_MODIFIED - The date the current file was last modified. This is another trick the "big guys" use. Don't worry yourself to death trying to remember to hand change your last modified date, let SSI take care of it for you! Simply add the following line to your HTML pages.

<!--#echo var="LAST_MODIFIED" -->

Includes
Server Side Includes
CGI Environment Variables