Get a list of the names of the files in the directory with opendir and readdir (or use glob), and then put the filename in a variable. Skeleton code:

my $directory = "/path/to/files";
opendir DIR, $directory or die "can't open $directory: $!\n";

while (my $file = readdir DIR) {
    next unless -f "$directory/$file";
    open FILE, "$directory/$file" or warn "Can't open $file: $!\n", ne
+xt;
    # do stuff to FILE
    close FILE;
}
closedir DIR;
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perl -e 'print "How sweet does a rose smell? "; chomp $n = <STDIN>; $r
+ose = "smells sweet to degree $n"; *other_name = *rose; print "$other
+_name\n"'
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