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-Changes since 1.2: (Too many to count!)
-
-A memory stomping bug was fixed (provoked by assigning a variable
-to its old value plus something else).
-
-Better signal handling; a real signal handler which manages a queue
-of pending signals was added.
-
-rc now ignores SIGQUIT and traps SIGINT even in non-interactive
-mode. Thus,
-
-	rc ed.sh
-
-will not do mysterious things if the shell script "ed.sh" calls a
-command like "ed" and then you hit ^C.
-
-rc now opens 0, 1, 2 on /dev/null if they are inherited closed.
-rc -o prevents this.
-
-A couple of stupid O(n^2) string appends were replaced with O(n)
-loops. This should make foo=`{cat /etc/termcap} bar=$^foo a little
-faster :-)
-
-Returning a list of signals from a function is now legal, so "return
-$status" should always work.
-
-The code has been revised, new printing routines have been added.
-
-rc no longer uses redundant braces when exporting functions.
-
-A first stab at a verification suite has been added (trip.rc).
-(someone, please help me make this comprehensive!)
-
-rc -p now does not initialize functions from the environment. This
-should make it easier to write shell scripts that don't need to
-assume anything about the environment.
-
-Inherited ignored signals are now ignored in the current shell and
-passed on ignored to the child processes. whatis -s also reflects
-this information.
-
-A file descriptor leak in the /dev/fd implementation of >{} was
-fixed.
-
-A variable set to '' was not imported from the environment; this
-has been fixed.
-
-Changes since 1.3beta:
-
-New Makefile/config.h setup.
-
-builtin echo may now be conditionally included out, to use a Goldwynism.
-
-builtin exit takes any legal exit status. If the status is not all zeros,
-rc exits with 1. (having "exit sigiot" produce a core dump would be going
-a little far, I think.)
-
-limit does not append a unit after a zero limit; 0g was too confusing.
-
-exec > /nonexistentfile does not cause rc to exit any more.
-
-If a noninteractive rc is started with sigint ignored, rc does not install
-its own signal handler.
-
-error messages produced by rc in a subshell were cleaned up. (rc erroneously
-reset the 'interactive' flag after a fork)
-
-print.c was cleaned up a little; no functionality was changed, but should
-be more portable now.
-
-a bug in rc-1.3beta (not previous versions) was fixed: setting the first
-element of $path to '' caused PATH to be exported as '':etc..
-
-getopt's "illegal option" message was gratuitously changed to something
-less abrupt.
-
-some dead code was removed from input.c
-
-%term was changed to %token in parse.y; apparently newer yacc's don't grok
-%term any more.
-
-a race condition in the signal handler was fixed.
-
-the variable in for() was getting evaluated each time through the loop
-(e.g., for (`{echo i;date>[1=2]} in 1 2 3)echo $i would print the date
-three times). This was cleaned up.
-
-a redundant fork() was removed from walk.c; this showed up when running
-a braced command with a redirection in the background. e.g., {a;b}>c&
-
-man pages for history and rc were cleaned up by david (thanks).
-
-rc set SIGQUIT and SIGTERM to SIG_DFL on background jobs---even when
-trying to do old-style backgrounding (i.e., don't use process groups,
-just ignore SIGINT & SIGQUIT & SIGTERM).
-
-$0 is now changed to the name of the signal when entering a signal
-handler. Thus it's possible to write code like
-
-	fn sigint sigterm sigquit {
-		switch ($0) {
-		case sigint
-			...
-		case sigterm
-			...
-
-wait with no arguments now prints the pid of any and all children
-that died with a signal. e.g.,
-
-	; wait
-	25321: terminated
-	25325: terminated
-
-as opposed to
-
-	; wait
-	terminated
-
-An error saving/restoring state in the input stream code would
-cause rc to exit with the (erroneous) command:
-
-	eval '|[a'
-
-FIFO's were not removed in a backgrounded command, e.g.,
-
-	cat <{echo hi}&
-
-Changes since rc-1.4beta:
-
-getopt was renamed to rc_getopt to avoid libc collisions.
-
-$cdpath with a / in it caused a cd to sometimes have two //'s at the
-front of the path. This is reserved by POSIX, so I changed it to skip
-one of the /'s.
-
-signal handling now emulates sh in the way I described in a previous
-message: the race condition present in older rc's whereby some SIGINTs
-got lost is now gone; any SIGINT received during a wait() is acted upon
-at the end of the wait(), unless of course SIGINT is being deliberately
-ignored.
-
-getopt was renamed to avoid naming conflicts with libc. Also a sound
-move since rc_getopt is no longer quite libc-getopt compatible; I had
-to add in a mechanism for resetting getopt.
-
-signal handler code in fn.c was cleaned up; there were several bugs
-in rc-1.4beta, notably the shell sometimes spawned background jobs
-with SIGTERM ignored. I took the opportunity to make things a little
-cleaner here.
-
-a quasi-memory leak in the code for while() was fixed: a long-running
-while that had rc commands allocating memory in it could cause the
-shell to grow without bounds. I fixed this by placing the while loop
-(*and* test!) inside a new allocation arena each time through the loop.
-
-A new configuration parameter, NOJOB, was added to allow you to force
-v7-style backgrounding (no setpgrp, ignore SIGINT and SIGTERM).
-
-The FIFO code was reworked a little. It should be more robust now---
-FIFOs get removed at the end of the command of the argument list
-that they were on:
-
-		fn foo {echo $*; cat $*}
-		foo<{echo hi}
-
-now works as expected. Also FIFO names are pushed onto the exception
-stack so that their removal occurs in the face of exceptions and so
-on.
-
-A memory leak in treefree() was plugged up --- the root node of a
-function was not getting freed.
-
-Changes since rc-1.4:
-
-General changes:
-
-        Some small memory leaks/uninit references revealed by Purify.
-
-        $bqstatus for querying the exit status of a backquote.
-
-        Globbing through unreadable directories.
-
-        More options to whatis.
-
-        History append which always re-opens the file (avoids
-        inconsistencies over multiple NFS-mounted accesses to
-        $history).
-
-        Support "rc -s".
-
----------
-
-Makefile:	Added comment referring to README for yacc/malloc problem.
-
-uiltins.c:	Added more options to whatis, protected rlimit prototypes
-		with #ifndef SYSVR4, renamed SIGCHK to sigchk.
-
-except.c:	Patched nl_on_intr printing to happen only in interactive
-		shells.
-
-exec.c:		Added comment explaining nl_on_intr variable, renamed SIGCHK
-		to sigchk.
-
-fn.c:		Replaced by-hand consing of exception stack etc. for signal
-		handler execution with call to funcall(). Replaced fun2str
-		call with call on print routines.
-
-footobar.c:	Got rid of memory leak in get_name(), parenthesize count,
-		flat and var nodes for correctness in unparsing, removed
-		list2str, made get_name use nalloc space, merge in a
-		better parse_var from es.
-
-glob.c:		Split out a test so that closedir is called correctly, renamed
-		SIGCHK to sigchk.
-
-glom.c:		Added bqstatus, renamed SIGCHK to sigchk, removed spurious
-		setsigdefaults, patched uninit memory reference, rename
-		"clear" to "memzero", wait for bq subproc to finish on EINTR.
-
-hash.c:		Added options to function/variable print code.
-
-history/history.c: Added '@' to the list of chars which can precede an
-		ignored '-'.
-
-input.c:	Got rid of tiny memory leak in closefds, got rid of uninit
-		memory reference in popinput, moved nul ignored check into
-		realgchar(), changed history append to always reopen the
-		history file, replaced SIGCHK with sigchk. Freed memory
-		returned by call to readline().
-
-lex.c:		Corrected typo in comment, moved nul character ignore code
-		to input routines.
-
-main.c:		Added -s flag.
-
-nalloc.c:	Added convenience feature to erealloc. (Allow NULL parameter)
-
-print.c:	Changed use of va_start so broken compilers can compile
-		print code.
-
-proto.h:	Added fake memset.
-
-rc.h:		Replaced clear() function prototype with a macro call on
-		memset(), removed SIGCHK, fixed prototypes.
-
-signal.c:	Removed unconditional exit in catcher code, renamed SIGCHK
-		to sigchk.
-
-status.c:	Rewrite sgetstatus breaking out strstatus so that bqstatus
-		can be set from glom routines.
-
-utils.c:	Got rid of clear() (use memset from C library), rename SIGCHK
-		to sigchk.
-
-var.c:	 	Got rid of memory leak in listassign(), converted list2str()
-		call to something using the print routines.
-
-version.c:	New version string.
-
-wait.c:		Got rid of memory leak in rc_fork, renamed SIGCHK to sigchk.
-
-walk.c:		Fixed pre-redirection bug, removed spurious setsigdefaults(),
-		renamed SIGCHK to sigchk.
-
-
-Changes since rc-1.5beta1
-
-	Configuration: rc now uses GNU autoconf.
-
-	Portability: mksignal works on HPUX 10.
-
-	Portability: resources can be (quad_t).
-
-	Bug: if rc was started with SIGCLD == SIG_IGN (e.g. by Solaris's
-	rshd) it would loop.  Fixed by resetting SIGCLD to SIG_DFL if it
-	was SIG_IGN when rc was started.
-
-	Portability: POSIXish systems don't have NGROUPS.