diff -ru bin/sh.orig/miscbltin.c bin/sh/miscbltin.c
--- bin/sh.orig/miscbltin.c	2004-04-22 13:52:53.000000000 -0300
+++ bin/sh/miscbltin.c	2004-09-12 16:36:56.000000000 -0300
@@ -348,6 +348,9 @@
 #ifdef RLIMIT_POSIXLOCK
 	{ "posixlocks",		(char *)0,	RLIMIT_POSIXLOCK,  1, 'k' },
 #endif
+#ifdef RLIMIT_FORK
+	{ "fork depth",		(char *)0,	RLIMIT_FORK,	   1, 'r' },
+#endif
 	{ (char *) 0,		(char *)0,	0,		   0, '\0' }
 };
 
@@ -364,7 +367,7 @@
 	struct rlimit	limit;
 
 	what = 'f';
-	while ((optc = nextopt("HSatfdsmcnuvlbk")) != '\0')
+	while ((optc = nextopt("HSatfdsmcnuvlbkr")) != '\0')
 		switch (optc) {
 		case 'H':
 			how = HARD;
diff -ru bin/sh.orig/sh.1 bin/sh/sh.1
--- bin/sh.orig/sh.1	2003-06-17 01:22:50.000000000 -0300
+++ bin/sh/sh.1	2004-09-12 16:37:38.000000000 -0300
@@ -1819,7 +1819,7 @@
 For aliases the alias expansion is printed;
 for commands and tracked aliases
 the complete pathname of the command is printed.
-.It Ic ulimit Oo Fl HSabcdflmnstuv Oc Op Ar limit
+.It Ic ulimit Oo Fl HSabcdflmnrstuv Oc Op Ar limit
 Set or display resource limits (see
 .Xr getrlimit 2 ) .
 If
@@ -1872,6 +1872,8 @@
 The maximal resident set size of a process, in kilobytes.
 .It Fl n Ar nofiles
 The maximal number of descriptors that could be opened by a process.
+.It Fl r Ar forkdepth
+The maximal depth of the process tree having the current process as its root.
 .It Fl s Ar stacksize
 The maximal size of the stack segment, in kilobytes.
 .It Fl t Ar time