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#use strict;
use warnings;
...
# somewhere in your code and then

$the_varaible_I_want_to_check = 1;

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 typ
+o at d:/tmp/pm/t_typo.pl line 8.