From: Pen Ttt <myocean135@...>
Date: 2010-05-28T11:51:33+09:00
Subject: Re: how to call gnuplot from ruby?

i don't know the difference of w and  r.
program_a1:
f=IO.popen("gunzip -c ~/grid.zip","w")
while line=f.gets
print line
end
program_a2:
f=IO.popen("gunzip -c ~/grid.zip","r")
while line=f.gets
print line
end
program_a1 and program_a2  all can run ,what's the difference?

there is game--freeciv  installed in my computer.
programb1:
File.popen("/usr/games/civ","w") do |pipe|
quote = pipe.gets
puts quote
end

programb2:
File.popen("/usr/games/civ","r") do |pipe|
quote = pipe.gets
puts quote
end
program_b1 and program_b2  all can run ,what's the difference?

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