<!--#echo var="$env" -->
When you try to echo something that is invalid you get the following error message: (none)
<!--#echo var="DOCUMENT_NAME" -->
This is the name of the document the echo command is in: ssi3.shtml
<!--#echo var="DOCUMENT_uri" -->The path to this file is /pub/doc/linux/ssi3.shtml.
<!--#echo var="DATE_LOCAL" -->The current local time is Saturday, 18-Oct-2025 04:40:22 MST.
<!--#echo var="DATE_GMT" -->The Greenwich Mean Time is Saturday, 18-Oct-2025 11:40:22 GMT.
<!--#echo var="last_modified" -->This file was last modified on Sunday, 12-May-2002 02:10:09 MST.