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File.head
Daniel Berger edited this page May 22, 2021
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The File.head method is similar to the head command line tool in that it returns the first X lines of a file. In block form, yields the first num_lines (default: 10) from the file. In non-block form, returns an Array lines instead.
# Return an array
File.head('somefile.txt') # => ['This is line1', 'This is line2', ...]
# Return an array, first 20 lines
File.head('somefile.txt', 20) # => ['This is line1', 'This is line2', ...]
# Use a block
File.head('somefile.txt'){ |line| puts line }