e17 => 'Please don\'t use the words: @_ on here',
e18 => 'Cannot connect to $_[0] ($!)',
e19 => 'Invalid character in line',
- e20 => 'token $_[0] not recognised',
+ e20 => qq{token '$_[0]' not recognised},
e21 => '$_[0] is not numeric',
e22 => '$_[0] is not a callsign',
e23 => '$_[0] is not a range (eg 0/30000)',