Because https://httpd.apache.org/docs/2.2/howto/public_html.html#cgi / Apache Tutorial: Dynamic Content with CGI and more

Copy/paste from Re: To call a .pl file when a button is pressed on a GUI created using Perl CGI (webserver) for the links below

Its simple, you need a webserver

Why? Because webpages and CGI needs a webserver, thats how it works

Its weird that so many folks manage to create a GUI using Perl CGI without understanding this

learn about the internet,Web Programming: For Beginners, to get an overall picture of how the internet works, how tcp/ip, sockets, html, ajax, all fit together....

See also Mojolicious::Lite +and jQuery +AJAX + Mojo::Template

And a copy-pasta for you:)

Also, there are checklists for that , Basic debugging checklist , brian's Guide to Solving Any Perl Problem, CGI Help Guide , Troubleshooting Perl CGI scripts

Yes, work through these checklists, when you find a problem on the list, use a solution from the list, when you find a problem not on the list (rare), post the error message and problem description here

brian's Guide to Solving Any Perl Problem, CGI Help Guide , Troubleshooting Perl CGI scripts

So examine your server configuration and compare to https://httpd.apache.org/docs/2.2/howto/public_html.html#cgi / Apache Tutorial: Dynamic Content with CGI

learn about the internet,Web Programming: For Beginners, to get an overall picture of how the internet works, how tcp/ip, sockets, html, ajax, all fit together.

... let the deep links from the following explain Re: Cron revisited/Re^2: Perl Module Not Working In Crontab explain, and here they are:

• Perl/UNIX .profile problem
• Unix Aliases?
• Perl Script Not Working With Crontab
• Twig in a crontab?
• Running Perl program w/root privs via cron
• system call in crontab
• Perl & cron job environmental variables
• HowTo: Add Jobs To cron Under Linux or UNIX?
• Unix FAQ - Cron
• Unix FAQ - Cron
  Cron jobs do not inherit the login environment of the user
  Cron jobs do not have a stdin associated with them
  ...
• Cron Frequently Asked Questions
• Cron Job FAQ
• Basic Linux Operations FAQ
• Automating Tasks with Cron and Crontab files
• 4.4. Scheduling processes
  
• system command is not working
• I have some problem with Crontab
• perl file doesn't execute
• script fails loading module version, but > version is installed
• CGI Help Guide , Troubleshooting Perl CGI scripts
  
• Csh Programming Considered Harmful
  
• How do I set env. Variables from Perl with shell script
• Get default login environment
• Set shell environment variables from within a perl script
• How to change a script's environment after the script is already run, based on shell sourcing ?
• Perl: Source shell script to for environment variables?
• Reading and setting the environment from a shell script for the calling program
• Importing environment variables from shell script file to Perl
• sourcing a shell script/.profile and importing into %ENV
• setting perl ENV from file
• Changing parent process environment variable
  
• Re^3: DBD::mysql fail install check (DYLD_LIBRARY_PATH ldd otool install_name_tool VERSIONER_PERL_PREFER_32_BIT .bundle/.dylib/.so
  
• Making a system command work via a scheduled task.
• How to troubleshoot scheduled tasks in Windows XP and in Windows Server 2003
• Re^6: pp and multiple perl scripts
• Basic debugging checklist , brian's Guide to Solving Any Perl Problem