{HEAD ~ Other operations} include reading a directory, creating a file, removing a file, retrieving file attributes, modifying file attributes, and locking {TAIL ~ a file} 
include locking
{ HEAD ~ Other operations } include reading a directory , creating a file , removing a file , retrieving file attributes , modifying file attributes , and locking { TAIL ~ a file }
HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL