upstream: Allow "SendEnv -PATTERN" to clear environment variables

previously labeled for sendind. bz#1285 ok dtucker@

OpenBSD-Commit-ID: f6fec9e3d0f366f15903094fbe1754cb359a0df9

1 files changed, 8 insertions, 3 deletions

diff --git a/ssh_config.5 b/ssh_config.5
index 75a21b595..0e3c4db2e 100644
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -33,8 +33,8 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh_config.5,v 1.270 2018/04/05 22:54:28 djm Exp $
-.Dd $Mdocdate: April 5 2018 $
+.\" $OpenBSD: ssh_config.5,v 1.271 2018/04/06 13:02:39 djm Exp $
+.Dd $Mdocdate: April 6 2018 $
 .Dt SSH_CONFIG 5
 .Os
 .Sh NAME
@@ -1394,11 +1394,16 @@ Multiple environment variables may be separated by whitespace or spread
 across multiple
 .Cm SendEnv
 directives.
-The default is not to send any environment variables.
 .Pp
 See
 .Sx PATTERNS
 for more information on patterns.
+.Pp
+It is possible to clear previously-set
+.Cm SendEnv
+variable names by prefixing patterns with
+.Pa - .
+The default is not to send any environment variables.
 .It Cm ServerAliveCountMax
 Sets the number of server alive messages (see below) which may be
 sent without