If the file is not present on the client or if the command would fail, {TAIL ~ the present invention} ignores {HEAD ~ the command} and does not attempt to execute it later 
If the file is not present on the client or if the command would fail , { TAIL ~ the present invention } ignores { HEAD ~ the command } and does not attempt to execute it later
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH