This will kill all sessions and detach clients except the session specified
with "-a" and "-t" -- and where "-t" is not given, assumes current session.
---
 trunk/cmd-kill-session.c |   20 ++++++++++++++------
 trunk/tmux.1             |    7 ++++++-
 2 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/trunk/cmd-kill-session.c b/trunk/cmd-kill-session.c
index da56a26..0ce65e6 100644
--- a/trunk/cmd-kill-session.c
+++ b/trunk/cmd-kill-session.c
@@ -31,8 +31,8 @@ int   cmd_kill_session_exec(struct cmd *, struct cmd_ctx *);
 
 const struct cmd_entry cmd_kill_session_entry = {
        "kill-session", NULL,
-       "t:", 0, 0,
-       CMD_TARGET_SESSION_USAGE,
+       "at:", 0, 0,
+       "[-a] " CMD_TARGET_SESSION_USAGE,
        0,
        NULL,
        NULL,
@@ -43,13 +43,21 @@ int
 cmd_kill_session_exec(struct cmd *self, struct cmd_ctx *ctx)
 {
        struct args     *args = self->args;
-       struct session  *s;
+       struct session  *s, *s2, *s3;
 
        if ((s = cmd_find_session(ctx, args_get(args, 't'), 0)) == NULL)
                return (-1);
 
-       server_destroy_session(s);
-       session_destroy(s);
-
+       if (args_has(args, 'a')) {
+               RB_FOREACH_SAFE(s2, sessions, &sessions, s3) {
+                       if (s != s2) {
+                               server_destroy_session(s2);
+                               session_destroy(s2);
+                       }
+               }
+       } else {
+               server_destroy_session(s);
+               session_destroy(s);
+       }
        return (0);
 }
diff --git a/trunk/tmux.1 b/trunk/tmux.1
index 34d0232..4f03a4f 100644
--- a/trunk/tmux.1
+++ b/trunk/tmux.1
@@ -609,9 +609,14 @@ If it does exist, exit with 0.
 Kill the
 .Nm
 server and clients and destroy all sessions.
-.It Ic kill-session Op Fl t Ar target-session
+.It Ic kill-session
+.Op Fl a
+.Op Fl t Ar target-session
 Destroy the given session, closing any windows linked to it and no other
 sessions, and detaching all clients attached to it.
+If
+.Fl a
+is given, all sessions but the specified one is killed.
 .It Xo Ic list-clients
 .Op Fl F Ar format
 .Op Fl t Ar target-session
-- 
1.7.10


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