of many a computer user
. Some programs are sensitive
. Normally inconvenient, but sometimes a catastrophe
. Like when you inadvertantly leave whitespace at the end
of a line
. Unless you set up some special editing mode
s, this whitespace is invisible
, yet your file won't work.
An example of a horrible place for trailing whitespace is the end of a Perl here document. If you have something like this:
$x = <<END;
This is the first line
This is the second
(highlight the "
" line to see what's going on!), Perl won't recognise the terminator
This can waste a significant amount of time out of your life.