BEGINNER
Start
What is CGI?
Getting a Script
Where your files are
Changing Variables I
Changing Variables II
Final Tweaks
>>Summary
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Your guestbook is now up and running. The important things to take away from this tutorial are:
- Any HTML files your scripts are altering need to be in your cgi-bin.
- The URL of any file in your cgi-bin (while your script is running) is: http://cgi.tripod.com/your_membername/cgi-bin/filename
- The system location of any file in your cgi-bin is the root directory.
- You don't need to change the permissions of files in your cgi-bin; besides, you wouldn't be able to if you tried.
- You don't need to worry about the location of Perl on Tripod; the CGI server ignores any headers on your Perl scripts
Using this information, you should be able to get most ready-made scripts running on your Tripod site, as well as any scripts you write from scratch.
There are some important limitations to consider when running CGI scripts on Tripod. Certain Perl commands have been disabled for security reasons. This is
to prevent people from performing malicious acts, such as reading your private directories. People doing normal Web-site programming very rarely use most of
these commands, but there are a few more common commands that you might want to know about. These are:
system
exec
fork
chown
chmod
sleep
unlink
kill
eval
All commands involving sockets
We've also limited how many system resources are available to each script. For example, a script can only use up to one second of CPU time before it is deemed
to be causing problems and is terminated. This makes sure that people don't accidentally -- or intentionally -- write scripts that run endlessly and eat up all
of the server's resources. It's unlikely that you'll run into system-resource constraints unless you're running a script which requires an exceptional amount of
processing time or memory in order to do its thing.
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