#use strict;
use warnings;

my $the_variable_I_want_to_check = 0;

# somewhere in your code and then

$the_varaible_I_want_to_check = 1;

##</code><code>##

C:/Perl_524/bin\perl.exe -w d:/tmp/pm/t_typo.pl 
Name "main::the_varaible_I_want_to_check" used only once: possible typo at d:/tmp/pm/t_typo.pl line 8.