This subject has been 'answered' on various web resources, but I don't find it works for me; I get an extra space after tab-completion, using Term::ReadLine::Gnu even though I set the attribute 'completion_suppress_append' which allegedly works for Gnu readline. Well, it won't work for me on cygwin (latest 32-bit release) with perl 5.14.12. I can't tell if this is a cygwin issue or a perl issue - any ideas how to debug? - it's driving me potty! 
use Term::ReadLine;

my @commands = qw(one two three four five six seven eight nine ten);
my $term = Term::ReadLine->new('test');

if (my $attr = $term->Attribs) {
    my $pkg = Term::ReadLine->ReadLine();
    print "package is $pkg\n";
    $term->ornaments(0);
    $attr->{basic_word_break_characters}     = ". \t\n";
    $attr->{completer_word_break_characters} = " \t\n";
    $attr->{completion_function} = \&complete_word;
    $attr->{completion_suppress_append} = 1; # doesn't work! :(
    $attr->{completion_append_character} = "\0"; # nor this
}

while (1) {    
    my $Command = $term->readline("Cmd>");
    print "command:>$Command<\n";
}

sub complete_word {
    my ($text, $line, $start) = @_;
    return grep(/^$text/, @commands);
}

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TIA!

In reply to term::readline::gnu extra spaces on completion by daverowntree

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