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# predeclare subroutines so subs; can be called before being declared
# and without ()

# one line to make sure there is one and only one "/"
$target_dir=~s<^/*></>;

#get first character in target_dir
 my $first_char = substr( $target_dir, 0, 1 );
...
 }

#verify that file exists
 checkFileExists() if ( ! $interactive );