First Challenge

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diff --git a/challenge-028/dave-jacoby/perl5/ch-1.pl b/challenge-028/dave-jacoby/perl5/ch-1.pl
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+#!/usr/bin/env perl
+
+use strict;
+use warnings;
+use utf8;
+use feature qw{ postderef say signatures state switch };
+no warnings
+    qw{ experimental::postderef experimental::smartmatch experimental::signatures };
+
+# Write a script to check the file content without explicitly
+# reading the content. It should accept file name with path as
+# command line argument and print "The file content is binary."
+# or else "The file content is ascii." accordingly.
+
+use Cwd 'abs_path';
+
+for my $file (@ARGV) {
+    filetest($file);
+}
+
+sub filetest($file) {
+    my $path = abs_path($file);
+    return unless -e $path;
+    return unless -f $path;
+    say $file;
+    if    ( -T $path ) { say "\tThe file content is ascii" }
+    elsif ( -B $path ) { say "\tThe file content is binary" }
+}
+
+# the interesting thing is that zero-length files are accepted as both.
+# to keep that from happening, I used elsif and assumed ascii first