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Useful
Environment Variables
"The Echo Command"
commonly seen on web pages.
Server
Side Include (SSI) commands are executed by the server as it parses
your HTML file. Server side includes can be used to include the
value of various server environment variables within your HTML such
as the local date and time. One might use a server side include
to add a signature file to an HTML file or company logo.
HTML files containing SSI must be named with an shtml extension.
SSI commands are easy to add to your HTML, but you must follow the
syntax exactly:
<!--#command cmd_argument="argument_value" -->
Be sure to leave a space after the ending quotation mark (") of
the argument variable.
Using the echo command
The
echo command can be used to display the content of the five server
side environment variables listed in the table below.
Variable DescriptionDate_Local Current date and time (determined
by server location).
Date_GMT Current date and time in Greenwich Mean Time.
Document_Name File name of the main document.
Document_URI Path and file name of the main document
Last_Modified Date and time the main document was last modified.
Example:
Date
and time determined by server location.
eg. <!--#echo var="Date_Local" -->
output: Monday, 14-Jul-97 11:33:04 EDT
Using the config command
The
config command can be used to configure the standard output of various
environment variables. In the following example, two SSI commands
are used in conjunction to produce an alternative date and time
format:
e.g. <!--#config timefmt="%A, %B %d, %Y %I:%M%p" -->
<!--#echo var="date_local" -->
output: Monday, July 14, 1997 11:33AM
Here is a breakdown date and time codes used in the example above:
%A Full weekday name
%B Full month name
%d Day of the month
%Y Year
%I Hour
%M Minutes
%p a.m. or p.m.
Other SSI Commands
The
fsize command might be helpful if you were to include a thumbnail
image and want to display the actual file size of the original image.
e.g. <!--#fsize file="image.gif" --> output: 10k
The include command can be used to include a signature file or company
logo within an HTML document. The added document or image will appear
as if it were part of the original document.
e.g. <!--#include file="any.htm" -->
If the file to be included is in a different directory than the
SHTML document. use the virtual command argument instead. In the
following example, the SHTML document resides in a subdirectory
but includes a file within account root directory:
eg. <!--#include virtual="/any.htm" -->
The exec command can be used to execute a CGI script when the web
page is loading. In the following example, the script date.pl within
the relative path /cgi-local is executed.
eg. <!--#exec cgi="/cgi-local/date.pl" -->
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