Index: sbin/md5/Makefile
===================================================================
--- sbin/md5/Makefile
+++ sbin/md5/Makefile
@@ -4,27 +4,47 @@
 PACKAGE=runtime
 PROG=	md5
 
-LINKS=	${BINDIR}/md5 ${BINDIR}/rmd160 \
+LINKS=	${BINDIR}/md5 ${BINDIR}/md5sum \
+	${BINDIR}/md5 ${BINDIR}/rmd160 \
+	${BINDIR}/md5 ${BINDIR}/rmd160sum \
 	${BINDIR}/md5 ${BINDIR}/sha1 \
 	${BINDIR}/md5 ${BINDIR}/sha224 \
+	${BINDIR}/md5 ${BINDIR}/sha224sum \
 	${BINDIR}/md5 ${BINDIR}/sha256 \
+	${BINDIR}/md5 ${BINDIR}/sha256sum \
 	${BINDIR}/md5 ${BINDIR}/sha384 \
+	${BINDIR}/md5 ${BINDIR}/sha384sum \
 	${BINDIR}/md5 ${BINDIR}/sha512 \
+	${BINDIR}/md5 ${BINDIR}/sha512sum \
 	${BINDIR}/md5 ${BINDIR}/sha512t256 \
+	${BINDIR}/md5 ${BINDIR}/sha512t256sum \
 	${BINDIR}/md5 ${BINDIR}/skein256 \
+	${BINDIR}/md5 ${BINDIR}/skein256sum \
 	${BINDIR}/md5 ${BINDIR}/skein512 \
-	${BINDIR}/md5 ${BINDIR}/skein1024
+	${BINDIR}/md5 ${BINDIR}/skein512sum \
+	${BINDIR}/md5 ${BINDIR}/skein1024 \
+	${BINDIR}/md5 ${BINDIR}/skein1024sum
 
-MLINKS=	md5.1 rmd160.1 \
+MLINKS=	md5.1 md5sum.1 \
+	md5.1 rmd160.1 \
+	md5.1 rmd160sum.1 \
 	md5.1 sha1.1 \
 	md5.1 sha224.1 \
+	md5.1 sha224sum.1 \
 	md5.1 sha256.1 \
+	md5.1 sha256sum.1 \
 	md5.1 sha384.1 \
+	md5.1 sha384sum.1 \
 	md5.1 sha512.1 \
+	md5.1 sha512sum.1 \
 	md5.1 sha512t256.1 \
+	md5.1 sha512t256sum.1 \
 	md5.1 skein256.1 \
+	md5.1 skein256sum.1 \
 	md5.1 skein512.1 \
-	md5.1 skein1024.1
+	md5.1 skein512sum.1 \
+	md5.1 skein1024.1 \
+	md5.1 skein1024sum.1
 
 LIBADD=	md
 
Index: sbin/md5/md5.1
===================================================================
--- sbin/md5/md5.1
+++ sbin/md5/md5.1
@@ -4,7 +4,9 @@
 .Os
 .Sh NAME
 .Nm md5 , sha1 , sha224 , sha256 , sha384 , sha512 , sha512t256 , rmd160 ,
-.Nm skein256 , skein512 , skein1024
+.Nm skein256 , skein512 , skein1024 ,
+.Nm md5sum , sha1sum , sha224sum , sha256sum , sha384sum , sha512sum ,
+.Nm sha512t256sum , rmd160sum , skein256sum , skein512sum , skein1024sum
 .Nd calculate a message-digest fingerprint (checksum) for a file
 .Sh SYNOPSIS
 .Nm
@@ -26,6 +28,15 @@
 or
 .Dq message digest
 of the input.
+The
+.Nm md5sum , sha1sum , sha224sum , sha256sum , sha384sum , sha512sum ,
+.Nm sha512t256sum , rmd160sum , skein256sum , skein512sum ,
+and
+.Nm skein1024sum
+utilities do the same, but default to the reversed format of
+the
+.Fl r
+flag.
 It is conjectured that it is computationally infeasible to
 produce two messages having the same message digest, or to produce any
 message having a given prespecified target message digest.
@@ -171,6 +182,13 @@
 .Pp
 The RIPEMD-160 page:
 .Pa http://www.esat.kuleuven.ac.be/~bosselae/ripemd160.html .
+.Sh BUGS
+All of the utilities that end in
+.Sq sum
+are intended to be compatible with the GNU coreutils programs.
+However, the long arguments and
+.Fl -check
+functionality is not provided.
 .Sh ACKNOWLEDGMENTS
 This program is placed in the public domain for free general use by
 RSA Data Security.
Index: sbin/md5/md5.c
===================================================================
--- sbin/md5/md5.c
+++ sbin/md5/md5.c
@@ -177,13 +177,27 @@
 	char	buf[HEX_DIGEST_LENGTH];
 	size_t	len;
  	unsigned	digest;
- 	const char*	progname;
+ 	char	*progname;
 
  	if ((progname = strrchr(argv[0], '/')) == NULL)
  		progname = argv[0];
  	else
  		progname++;
 
+	/*
+	 * GNU coreutils has a number of programs named *sum. These produce
+	 * similar results to the BSD version, but in a different format,
+	 * similar to BSD's -r flag. We install links to this program with
+	 * ending 'sum' to proide this compatibility. Check here to see if the
+	 * name of the program ends in 'sum', set the flag and drop the 'sum' so
+	 * the digest lookup works.
+	 */
+	len = strlen(progname);
+	if (len > 3 && strcmp(progname + len - 3, "sum") == 0) {
+		progname[len - 3] = '\0';
+		rflag = 1;
+	}
+
  	for (digest = 0; digest < sizeof(Algorithm)/sizeof(*Algorithm); digest++)
  		if (strcasecmp(Algorithm[digest].progname, progname) == 0)
  			break;