That's because you're only asking Perl to read one line with my $content = <HANDLE>;. If you preceeded the open with local $/; it would work, i.e., you'd slurp all the file's contents into $content, because you've set a local copy of Perl's record seperator ($/) to undef.
However, try the following idiomatic way, too:
#!/usr/bin/perl
use strict;
use warnings;
use diagnostics;
my $content = do { local $/; <> };
print "$content\n";
When you've passed a file to a script on the command line for reading, you don't need to explicitely open it, as using only <> will read it.
Hope this helps!
BTW - For your future reference, always use the three-argument open, e.g., open my $fh, '<', $fileloc or die "Cannot open file: $!";
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