truncate(p1) public

Truncates file to at most integer bytes. The file must be opened for writing. Not available on all platforms. 

   f = File.new("out", "w")
   f.syswrite("1234567890")   #=> 10
   f.truncate(5)              #=> 0
   f.close()                  #=> nil
   File.size("out")           #=> 5
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