It's right there in the CGI documentation (perldoc CGI):

       FETCHING THE NAMES OF ALL THE PARAMETERS PASSED TO YOUR SCRIPT:

            @names = $query->param

       If the script was invoked with a parameter list (e.g.
       "name1=value1&name2=value2&name3=value3"), the param() method w
+ill
       return the parameter names as a list.  If the script was invoke
+d as an
       <ISINDEX> script and contains a string without ampersands (e.g.
       "value1+value2+value3") , there will be a single parameter name
+d "key-
       words" containing the "+"-delimited keywords.
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FETCHING THE NAMES OF ALL THE PARAMETERS PASSED TO YOUR SCRIPT:

            @names = $query->param
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Iirc that this will return only POST parameters if there are any POST parameters, so you might want to check for url_param as well.

my @names = $query->param;
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Could you explain how we can "proceed to fetch the values one by one"? All I can do right now is just get the list of the variables...but I can't actually get their values. Sorry to reply to such an old post. Thank you in advance!

but I can't actually get their values. Sorry to reply to such an old post. Thank you in advance!

That is because you skipped the requisite reading step. CGI. Basically, you give param an argument, it returns values.

foreach $name ( @names ) { if ( $name =~ /\_/ ) { next; } else { print "

".$name."\t=\t".$query->param($name) . "

\n"; } some thing like this you can do