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Why the "'"?

@kingu Here ' is used as a flag character which allows us to show the , delimiter depending on the number, e.g. 1,000,000 items. From $ man printf.3:

   Flag characters
       The character % is followed by zero or more of the following flags:
       ……

       '      For  decimal  conversion (i, d, u, f, F, g, G) the output is to be grouped with thousands' grouping characters if the locale information indicates any.  (See setlocale(3).)  Note that many versions of gcc(1) cannot parse
              this option and will issue a warning.  (SUSv2 did not include %'F, but SUSv3 added it.)