From: "Peña, Botp" <botp@...>
Date: 2008-03-07T11:34:54+09:00
Subject: Re: IO#Foreach  -- Max line length

On Behalf Of Tristin Davis:
# But by the time you actually get count, isn't the line 
# already read in 
# memory.  So if the line is 7 gigabytes, it'll probably crash 
# the system.

read will accept arg on how many bytes to read.

so how about,

irb(main):040:0> File.open "test.rb" do |f| f.read end
=> "a=(1..2)\n\na\nputs a\n\nputs a.each{|x| puts x}"

irb(main):041:0> File.open "test.rb" do |f| f.read 2 end
=> "a="

irb(main):042:0> File.open "test.rb" do |f| f.read 2; f.read 2 end
=> "(1"

irb(main):043:0> File.open "test.rb" do |f| while x=f.read(2); p x; end; end
"a="
"(1"
".."
"2)"
"\n\n"
"a\n"
"pu"
"ts"
" a"
"\n\n"
"pu"
"ts"
" a"
".e"
"ac"
"h{"
"|x"
"| "
"pu"
"ts"
" x"
"}"
=> nil

kind regards -botp