Implement GNU's extension of 'status' operand. The GNU syntax is

borrowed where syntax status=noxfer means no transfer statistics
and status=none means no status information at all.

This feature is useful because the statistics information can
sometimes be annoying, and redirecting stderr to /dev/null would
mean error messages also gets silenced.

Obtained from:	OpenBSD
MFC after:	2 weeks

1 files changed, 15 insertions, 2 deletions

diff --git a/bin/dd/dd.1 b/bin/dd/dd.1
index fa6d9a9..0541df8 100644
--- a/bin/dd/dd.1
+++ b/bin/dd/dd.1
@@ -32,7 +32,7 @@
 .\"     @(#)dd.1	8.2 (Berkeley) 1/13/94
 .\" $FreeBSD$
 .\"
-.Dd October 1, 2013
+.Dd April 2, 2014
 .Dt DD 1
 .Os
 .Sh NAME
@@ -156,6 +156,17 @@ Otherwise, input data is read and discarded.
 For pipes, the correct number of bytes is read.
 For all other devices, the correct number of blocks is read without
 distinguishing between a partial or complete block being read.
+.It Cm status Ns = Ns Ar value
+Where
+.Cm value
+is one of the symbols from the following list.
+.Bl -tag -width ".Cm noxfer"
+.It Cm noxfer
+Do not print the transfer statistics as the last line of status output.
+.It Cm none
+Do not print the status output.
+Error messages are shown; informational messages are not.
+.El
 .It Cm conv Ns = Ns Ar value Ns Op , Ns Ar value ...
 Where
 .Cm value
@@ -410,7 +421,9 @@ utility is expected to be a superset of the
 standard.
 The
 .Cm files
-operand and the
+and
+.Cm status
+operands and the
 .Cm ascii ,
 .Cm ebcdic ,
 .Cm ibm ,