http://qs1969.pair.com?node_id=254958


in reply to Re: Plotting XP
in thread Plotting XP

perldoc -f open

[...] You can put a '+' in front of the '>' or '<' to indicate you want both read and write access to the file; thus  '+<' is almost always preferred for read/write updates--the '+>' mode would clobber the file first.