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Full Discussion: perl cgi script not working
Top Forums Web Development perl cgi script not working Post 302585478 by yifangt on Wednesday 28th of December 2011 12:53:24 PM
Old 12-28-2011
perl cgi script not working
Hello,
Met a problem learning perl cgi script.
Code:
1 #!/usr/bin/perl -wT 
  2  
  3 use strict; 
  4 use CGI qw(:standard); 
  5  
  6 my $q = new CGI; 
  7  
  8 my $filename = $q->param('/home/yifangt/hello.cgi'); 
  9 my $contenttype = $q->uploadInfo($filename)->{'Content-Type'}; 
 10  
 11 print header; 
 12 print start_html; 
 13 if ($contenttype !~ /^text\/html$/) { 
 14         print "Only HTML is allowed<P>"; 
 15         print end_html; 
 16         exit; 
 17 } else  { 
 18  
 19 print "Type is $contenttype<P>"; 
 20 } 
 21  
 22 print end_html; 
 23

The error message from my /var/apache2/error.log is:

Code:
Use of uninitialized value $filename in scalar dereference at (eval 3) line 3.
Use of uninitialized value in hash element at (eval 3) line 3.
Can't use an undefined value as a HASH reference at /usr/lib/cgi-bin/Listing4-2.cgi line 9.
[Wed Dec 28 11:37:10 2011] [error] [client 127.0.0.1] Premature end of script headers: Listing4-2.cgi

I was wondering why Line 9 was of problem
Code:
9 my $contenttype = $q->uploadInfo($filename)->{'Content-Type'};

which actually looks fine. It can't be Line 3 which is a routine perl line:
Code:
3 use strict;

Have spent some time on this, could not figure out the reason. Appreciate any clues on this from a cgi beginner. Thanks a lot! Happy New Year!!
 

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LEARN ABOUT DEBIAN

hobbitcgi.cfg

HOBBITCGI.CFG(5)						File Formats Manual						  HOBBITCGI.CFG(5)

NAME

       hobbitcgi.cfg - Command-line parameters for the Xymon CGI tools

SYNOPSIS

       $BBHOME/etc/hobbitcgi.cfg

DESCRIPTION

       hobbitcgi.cfg(1) controls the commandline options passed to all of the Xymon CGI tools through their respective shell-script wrappers. Typ-
       ically the options listed here are used for system-wide configuration of the CGI utilities, e.g. to define where  they  read  configuration
       files.

       The exact set of commandline options available are described in the man-page for each of the CGI utilities.

       The file is "sourced" into the shell script wrapper, so assignments to the CGI-specific variables must follow standard shell-script syntax.

SETTINGS

       CGI_ACKINFO_OPTS
	      Options for the hobbit-ackinfo.cgi(1) utility.

       CGI_ACK_OPTS
	      Options for the bb-ack.cgi(1) utility.

       CGI_CSVINFO_OPTS
	      Options for the bb-csvinfo.cgi(1) utility.

       CGI_DATEPAGE_OPTS
	      Options for the bb-datepage.cgi(1) utility.

       CGI_ENADIS_OPTS
	      Options for the hobbit-enadis.cgi(8) utility.

       CGI_EVENTLOG_OPTS
	      Options for the bb-eventlog.cgi(1) utility.

       CGI_FINDHOST_OPTS
	      Options for the bb-findhost.cgi(1) utility.

       CGI_HIST_OPTS
	      Options for the bb-hist.cgi(1) utility.

       CGI_HOBBITCOLUMN_OPTS
	      Xymon-specific  options for column documentation. This uses the bb-csvinfo.cgi(1) utility with the server/etc/columndoc.cfg configu-
	      ration file.

       CGI_HOBBITCONFREPORT_OPTS
	      Options for the hobbit-confreport.cgi(1) utility.

       CGI_HOBBITGRAPH_OPTS
	      Options for the hobbitgraph.cgi(1) utility.

       CGI_HOSTGRAPHS_OPTS
	      Options for the hobbit-hostgraphs.cgi(1) utility.

       CGI_NKEDIT_OPTS
	      Options for the hobbit-nkedit.cgi(1) utility.

       CGI_NKVIEW_OPTS
	      Options for the hobbit-nkview.cgi(1) utility.

       CGI_REPLOG_OPTS
	      Options for the bb-replog.cgi(1) utility.

       CGI_REP_OPTS
	      Options for the bb-rep.cgi(1) utility.

       CGI_SNAPSHOT_OPTS
	      Options for the bb-snapshot.cgi(1) utility.

       CGI_SVCHIST_OPTS
	      Options for the hobbitsvc.cgi(1) utility when used to view historical logs. Note that the "--historical" option must be included	in
	      this setting.

       CGI_SVC_OPTS
	      Options for the hobbitsvc.cgi(1) utility.

SEE ALSO

       xymon(7), the individual CGI utility man-pages.

Xymon							    Version 4.2.3:  4 Feb 2009						  HOBBITCGI.CFG(5)
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