For what it's worth, if this is a script that you plan on sharing with others, don't hard-code vim. Some people are very particular about their choice of text editor.

my $editor = $ENV{EDITOR} || 'vim';
system $editor => $filename;
[download]

$ENV{EDITOR} is a very commonly used environment variable. cron uses it for editing crontabs; most VCS software (svn, git, hg, etc) uses it for editing log messages; etc.