===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/tmux.1,v
retrieving revision 1.642
retrieving revision 1.643
diff -u -r1.642 -r1.643
--- src/usr.bin/tmux/tmux.1	2019/05/02 20:12:40	1.642
+++ src/usr.bin/tmux/tmux.1	2019/05/03 20:44:24	1.643
@@ -1,4 +1,4 @@
-.\" $OpenBSD: tmux.1,v 1.642 2019/05/02 20:12:40 nicm Exp $
+.\" $OpenBSD: tmux.1,v 1.643 2019/05/03 20:44:24 nicm Exp $
 .\"
 .\" Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 .\"
@@ -14,7 +14,7 @@
 .\" IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 .\" OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: May 2 2019 $
+.Dd $Mdocdate: May 3 2019 $
 .Dt TMUX 1
 .Os
 .Sh NAME
@@ -2204,7 +2204,7 @@
 the command behaves like
 .Ic last-window .
 .It Xo Ic split-window
-.Op Fl bdfhvP
+.Op Fl bdfhIvP
 .Op Fl c Ar start-directory
 .Op Fl e Ar environment
 .Oo Fl l
@@ -2240,6 +2240,24 @@
 or full window width (with
 .Fl v ) ,
 instead of splitting the active pane.
+.Pp
+An empty
+.Ar shell-command
+('') will create a pane with no command running in it.
+Output can be sent to such a pane with the
+.Ic display-message
+command.
+The
+.Fl I
+flag (if
+.Ar shell-command
+is not specified or empty)
+will create an empty pane and forward any output from stdin to it.
+For example:
+.Bd -literal -offset indent
+$ make 2>&1|tmux splitw -dI &
+.Ed
+.Pp
 All other options have the same meaning as for the
 .Ic new-window
 command.
@@ -2822,7 +2840,7 @@
 is used as a login shell.
 .It Ic default-size Ar XxY
 Set the default size of new windows when the
-.Ar window-size
+.Ic window-size
 option is set to manual or when a session is created with
 .Ic new-session
 .Fl d .
@@ -4428,7 +4446,7 @@
 This command works only from inside
 .Nm .
 .It Xo Ic display-message
-.Op Fl apv
+.Op Fl aIpv
 .Op Fl c Ar target-client
 .Op Fl t Ar target-pane
 .Op Ar message
@@ -4455,6 +4473,10 @@
 prints verbose logging as the format is parsed and
 .Fl a
 lists the format variables and their values.
+.Pp
+.Fl I
+forwards any input read from stdin to the empty pane given by
+.Ar target-pane .
 .El
 .Sh BUFFERS
 .Nm