$ luarocks install fssLightweight cmdline fs search.
      usage:  lua /home/lighght/Xpace/fss/fss.lua <PATTERNS> <PATH>{ <PATH>}
      where:  <PATH>     ::= / | /<name>{/<name>} | <name>{/<name>}
              <PATTERNS> ::= <PATTERN>{,<PATTERN>}
              <PATTERN>  ::= <cstr>{.<cstr>
              <cstr>     ::= <consecutive str>
              <name>     ::= <file name>
            
      means:  given a group of patterns, 
              use each pattern to search in all paths recursively;
              and output the combined results in stdout.
            
       also:  if one path already satisfies, its children will not be included
            
       e.g.:  X.482.H    :   1 pattern, which finds Xpace/EECS-482/Homeworks
       e.g.:  Xp.e.482.H :   1 pattern, does the same
       e.g.:  Xe.482.H   :   1 pattern, but fails the prev search
       e.g.:  X.482.H,Y  :   2 patterns, find [<prev search>, Yggdrasill]
                             but no more children under Yggdrasill