sync with OpenBSD -current

usr.bin/tmux/tmux.1

@@ -1,4 +1,4 @@
-.\" $OpenBSD: tmux.1,v 1.941 2024/04/10 07:36:25 nicm Exp $
+.\" $OpenBSD: tmux.1,v 1.944 2024/05/14 09:32:37 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: April 10 2024 $
+.Dd $Mdocdate: May 14 2024 $
 .Dt TMUX 1
 .Os
 .Sh NAME
@@ -4881,6 +4881,14 @@ layout after every
 set-hook -g after-split-window "selectl even-vertical"
 .Ed
 .Pp
+If a command fails, the
+.Ql command-error
+hook will be fired.
+For example, this could be used to write to a log file:
+.Bd -literal -offset indent
+set-hook -g command-error "run-shell \\"echo 'a tmux command failed' >>/tmp/log\\""
+.Ed
+.Pp
 All the notifications listed in the
 .Sx CONTROL MODE
 section are hooks (without any arguments), except
@@ -4913,6 +4921,8 @@ Run when focus exits a client
 Run when a client is resized.
 .It client-session-changed
 Run when a client's attached session is changed.
+.It command-error
+Run when a command fails.
 .It pane-died
 Run when the program running in a pane exits, but
 .Ic remain-on-exit