$ test_platform.pl
-bash: test_platform.pl: command not found
$ ./test_platform.pl
Platform: cygwin
Executable: /home/ken/perl5/perlbrew/perls/perl-5.30.0/bin/perl

##</code><code>##

perl test_platform.pl
perl ./test_platform.pl
perl .\test_platform.pl

##</code><code>##

./test_platform.pl
.\test_platform.pl