each_line(*args) public

Executes the block for every line in ios, where lines are separated by sep. ios must be opened for reading or an IOError will be raised.

f = File.new("testfile")
f.each {|line| puts "#{f.lineno}: #{line}" }

produces:

1: This is line one
2: This is line two
3: This is line three
4: And so on...
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