Ruby/File Directory/sysread

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use the method sysread to read the contents of a file.

file3 = File.new("C:\\Ruby\\Sample"," r")
file3.sysread(20)
# This statement will output the first 20 characters of the file. 
# The file pointer will now be placed at the 21st character in the file.
Источник — «http://www.wiki.crossplatform.ru/index.php/Ruby/File_Directory/sysread»