-a     Scan files in their entirety. If -a is not specified, it is implementation-defined what portion of
       each file is scanned for strings.

-n  number
       Specify the minimum string length, where the number argument is a positive  decimal  integer.  The
       default shall be 4.

-t  format
       Write  each  string  preceded  by  its byte offset from the start of the file. The format shall be
       dependent on the single character used as the format option-argument: