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Top Forums Shell Programming and Scripting perl scalar variable in backquoted string Post 302139345 by cbkihong on Friday 5th of October 2007 12:39:51 PM
Old 10-05-2007
Quote:
Originally Posted by mehdi9
however I can not see the list from $myvar2 itself. I do not understand why this is.

I also tried to explicitly state a filename instead of $myvar2 and it works perfectly well. Looking forward to your solutions, and many thanks again.
Then this is more of a Perl CGI question. It sounds like it has nothing to do with backticks at all, so have you put in some debug statements to test if $myval2 is always empty or actually contains the value you expect as you run it in browser? I suppose you are referring to a form parameter 'add' retrieved via CGI->param() method. In case this is true, as I do not see the HTML which triggered the CGI script in action, it will be impossible to tell what the problem could be. The HTML (or in more complex cases, Javascript) will certainly affect how form parameters are being sent. So, to create a Web-based application, you cannot blindly use Perl (or other language)'s API to generate controls without understanding HTML, and you must verify the generated HTML to ensure they work in the way you expect.

Hopefully I did not misunderstand your question, but I guess you should probably look up some primer on CGI programming to help you get a more concrete idea of what you need to do.
 

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CGI::Pretty(3pm)					 Perl Programmers Reference Guide					  CGI::Pretty(3pm)

NAME
CGI::Pretty - module to produce nicely formatted HTML code SYNOPSIS
use CGI::Pretty qw( :html3 ); # Print a table with a single data element print table( TR( td( "foo" ) ) ); DESCRIPTION
CGI::Pretty is a module that derives from CGI. It's sole function is to allow users of CGI to output nicely formatted HTML code. When using the CGI module, the following code: print table( TR( td( "foo" ) ) ); produces the following output: <TABLE><TR><TD>foo</TD></TR></TABLE> If a user were to create a table consisting of many rows and many columns, the resultant HTML code would be quite difficult to read since it has no carriage returns or indentation. CGI::Pretty fixes this problem. What it does is add a carriage return and indentation to the HTML code so that one can easily read it. print table( TR( td( "foo" ) ) ); now produces the following output: <TABLE> <TR> <TD>foo</TD> </TR> </TABLE> Recommendation for when to use CGI::Pretty CGI::Pretty is far slower than using CGI.pm directly. A benchmark showed that it could be about 10 times slower. Adding newlines and spaces may alter the rendered appearance of HTML. Also, the extra newlines and spaces also make the file size larger, making the files take longer to download. With all those considerations, it is recommended that CGI::Pretty be used primarily for debugging. Tags that won't be formatted The following tags are not formatted: <a>, <pre>, <code>, <script>, <textarea>, and <td>. If these tags were formatted, the user would see the extra indentation on the web browser causing the page to look different than what would be expected. If you wish to add more tags to the list of tags that are not to be touched, push them onto the @AS_IS array: push @CGI::Pretty::AS_IS,qw(XMP); Customizing the Indenting If you wish to have your own personal style of indenting, you can change the $INDENT variable: $CGI::Pretty::INDENT = " "; would cause the indents to be two tabs. Similarly, if you wish to have more space between lines, you may change the $LINEBREAK variable: $CGI::Pretty::LINEBREAK = " "; would create two carriage returns between lines. If you decide you want to use the regular CGI indenting, you can easily do the following: $CGI::Pretty::INDENT = $CGI::Pretty::LINEBREAK = ""; AUTHOR
Brian Paulsen <Brian@ThePaulsens.com>, with minor modifications by Lincoln Stein <lstein@cshl.org> for incorporation into the CGI.pm distribution. Copyright 1999, Brian Paulsen. All rights reserved. This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. Bug reports and comments to Brian@ThePaulsens.com. You can also write to lstein@cshl.org, but this code looks pretty hairy to me and I'm not sure I understand it! SEE ALSO
CGI perl v5.18.2 2014-01-06 CGI::Pretty(3pm)
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