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  1. or download this
    /tmp>diff foo bar
    1,2c1,2
    ...
    < bar. Bla. Bar bla.
    ---
    > bar. Bla bar bla.
    
  2. or download this
    /tmp>diff -u foo bar
    --- foo 2021-01-31 15:13:16.892239748 +0100
    ...
    -bar. Bla. Bar bla.
    +bar. Bla bar bla.
     Foo bla bla nada bar.
    
  3. or download this
    /tmp>diff -y foo bar
    Bla bla. Foo bar baz.                                         | Bla ba
    +r. Foo bar baz.
    ...
    Foo foo foo! Bar. Foo                                           Foo fo
    +o foo! Bar. Foo
    bar. Bla. Bar bla.                                            | bar. B
    +la bar bla.
    Foo bla bla nada bar.                                           Foo bl
    +a bla nada bar.
    
  4. or download this
    /tmp>diff -n foo bar
    d1 2
    ...
    d4 1
    a4 1
    bar. Bla bar bla.
    
  5. or download this
    sub comparator {
    my $str1 = shift @_;
    ...
        return ($original, $revised);
        
    } #END SUB comparator
    
  6. or download this
    sub comparator 
    {
    ...
        
        return ($original, $revised);
    }