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#!/usr/bin/env perl
use 5.010;
...
    my $str = sprintf $pat, @$aref, $max_width, $long_string;
    print substr($str, 0, $max_width - 1), "|\n";
}

1.......10........20........30........40........50........60
79.30 2022/1/8  The quick brown fox jumps over the dog     |
394571.00 22/10/81  The quick brown fox jumps over the dog |
123456.78 12345/123/1234  The quick brown fox jumps over th|