user_mask

# File lib/fileutils.rb, line 793
 def user_mask(target) #:nodoc:
 target.each_char.inject(0) do |mask, chr|
 case chr
 when "u"
 mask | 04700
 when "g"
 mask | 02070
 when "o"
 mask | 01007
 when "a"
 mask | 07777
 else
 raise ArgumentError, "invalid `who' symbol in file mode: #{chr}"
 end
 end
 end