RCS ident fields

man ident

"$Author: $"
   The login name of the user who checked in the revi­sion.

"$Date: $" 
   The date and time the revision was checked in.
 
"$Header: $"
   A standard header containing the full  pathname  of the 
   RCS  file, the  revision number, the date and time, the author, 
   the state,  and  the  locker  (if locked).
 
"$Id: $"   
   Same  as  $Header$, except that the RCS filename is without 
   a path.
 
"$Locker: $"
   The login name of the user who locked the  revision 
   (empty if not locked).
 
"$Log: $"  
   The  log  message  supplied  during  checkin.   For
   ident's purposes, this is equivalent to  $RCSfile$.
 
"$Name: $" 
   The  symbolic  name used to check out the revision, if any.
 
"$RCSfile: $"
   The name of the RCS file without a path.
 
"$Revision: $"
   The revision number assigned to the revision.
 
"$Source: $"
   The full pathname of the RCS file.
 
"$State: $"
   The state assigned to  the  revision  with  the  -s
   option of rcs(1) or ci(1).