The basic file system operations are searching for {HEAD ~ a file} within {TAIL ~ a directory}, reading from a file, and writing to a file 
The basic file system operations are searching for { HEAD ~ a file } within { TAIL ~ a directory } , reading from a file , and writing to a file
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH