You need to
  1. Save the source file as UTF-8.
  2. Tell Perl that it is UTF-8.
  3. Tell Perl to encode the output as UTF-8. 
#! /usr/bin/perl
use warnings;
use strict;
use utf8;
use open IO => ':encoding(UTF-8)', ':std';

print sprintf ("%-6s", "°C").   "|\n";
print sprintf ("%-6s", "Deg C")."|\n";

[download]
Output (in a UTF-8 terminal): 
°C    |
Deg C |

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: Issue of formatting columns of data by choroba
in thread Issue of formatting columns of data by jmClifford

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