BSD 4_3 development

Work on file usr/contrib/tac/README

Synthesized-from: CSRG/cd1/4.3

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+Title:         tac
+
+Author:        Unknown off the net long ago, and
+               Jay Lepreau
+               Computer Science Dept.
+               Univ. of Utah
+               Salt Lake City, UT 84112
+               801-581-4285
+       
+Net:           lepreau@utah-cs.arpa, {ihnp4,decvax}!utah-cs!lepreau
+               Sometime lepreau@cs.utah.edu
+
+tac ("cat" backwards) is a small program which prints file segments
+in reverse order; by default it reverses by lines (like tail -r).
+Besides being able to reverse a file by segments delimited by an
+arbitrary string, its wins are that it is very fast, handles any
+size segments and any size files.  These make it an excellent
+filter, e.g. "tac <logfile> | egrep foo".
+
+tmail is a trivial shell script which uses tac to display one's
+mailbox, message by message, most recent first.
+
+Potential improvements to tac which I would appreciate having fed back to me:
+--segment by arbitrary regular expressions, but only if it's done
+       w/o sacrificing the current speed for the default case.
+--fix up handling of multiple files.
+--nicely integrate with tail somehow.
+
+1/11/86