7/28/2014 The Fool's Guide to CGI.pm, the Perl module for CGI scripting
http://www.cs.tut.fi/~jkorpela/perl/cgi.html 1/8
The Fool's Guide to CGI.pm,
the Perl module for CGI scripting
No, this guide is not for fools but by a fool, who had kept wondering how CGI.pm is supposed to work and
finally got a clue. So here's how (I think) it works in simplest cases. I hope this might make some other people's
learning curve a little better.
Content:
Prerequisites
Hello world
Just echoing data
Processing the data
Checking data
Quick reference to CGI.pm functions
Further reading
Prerequisites
You need
a little idea of how Web pages are created, especially a vague idea of HTML forms; actually it might suffice to
have used a simple query form, and you can hardly have avoided them when surfing. But just in case you
have, here's a sample form:
Google search
elementary knowledge about Perl; something like the following shouldn't scare you too much:
foo = 'hello world'; $foo =~ s/ / cruel /; print $foo;
a vague idea of what CGI is; you should faintly understand that some URLs, when accessed, may activate a
program (script) on a server; the following does:
http://www.cs.tut.fi/cgi-bin/run/~jkorpela/echo.cgi
some idea of what you might want to do with CGI scripting
capabilities of using CGI scripting in Perl on some server as well as local information on how to do
that; contact the local Web server's documentation or the server administration (webmaster@servername)
for information.
Hello world
OK, first do this: Check that you have the above-mentioned local information. Double-check that you have
understood it. You should now know where to put your Perl programs in order to run them as CGI scripts and
what you might need to do with them (setting file protections, perhaps). Fine, then test this with the following
script:
print <<END;
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<title>Hello</title>
<h1>Hello world!!</h1>
END
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