tmux.1

.\" $Id: tmux.1,v 1.29 2008-06-05 21:25:00 nicm Exp $
.\"
.\" Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
.\"
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.Dd November 9, 2007
.Dt TMUX 1
.Os
.Sh NAME
.Nm tmux
.Nd "terminal multiplexer"
.Sh SYNOPSIS
.Nm tmux
.Bk -words
.Op Fl vV
.Op Fl S Ar socket-path
.Op Ar command Op Ar arguments
.Ek
.Sh DESCRIPTION
.Nm
is a terminal multiplexer; it enables a number of terminals (or windows) to be
accessed and controlled from a single terminal.
.Pp
.Nm
runs as a server-client system. A server is created automatically when
necessary and holds a number of
.Em sessions ,
each of which may have a number of
.Em windows
linked to it. Any number of
.Em clients
may connect to a session, or the server
may be controlled by issuing commands with
.Nm .
Communication takes place through a socket, by default placed in
.Pa /tmp .
.Pp
The options are as follows:
.Bl -tag -width "XXXXXXXXXXXX"
.It Fl S Ar socket-path
Specify an alternative path to the server socket.
The default is
.Pa /tmp/tmux-UID ,
where
.Em UID
is the uid of the user who invoked
.Nm .
.It Fl v
Request verbose logging.
This option may be specified multiple times for increasing verbosity.
Log messages will be saved into
.Pa tmux-client-PID.log
and
.Pa tmux-server-PID.log
files in the current directory, where
.Em PID
is the pid of the server or client process.
.It Ar command Op Ar arguments
This specifies one of a set of commands used to control
.Nm ,
and described in the following sections.
If no command and arguments is specified, the
.Ic new-session
command is assumed.
.Pp
.El
.Sh QUICK START
To create a new tmux session running
.Xr vi 1 :
.Pp
.Dl $ tmux new-session vi
.Pp
Most commands have a shorter form, known as an alias.
For new-session, this is 
.Ic new :
.Pp
.Dl $ tmux new vi
.Pp
Alternatively, the shortest unambiguous form of a command is accepted.
If there are several options, they are listed:
.Bd -literal -offset indent
$ tmux n
ambiguous command: n, could be: new-session, new-window, next-window
$
.Ed
.Pp
Within an active session, a new window may be created by typing
.Ql ^B
(ctrl-B, known as the prefix key)
followed by the
.Ql c
key.
.Pp
Windows may be navigated with: 
.Ql ^B 0
(to select window 0),
.Ql ^B 1
(to select window 1), and so on;
.Ql ^B n
to select the next window; and
.Ql ^B p
to select the previous window.
.Pp
A session may be detached using
.Ql ^B d
and reattached with:
.Pp
.Dl $ tmux attach-session
.Pp
Typing 
.Ql ^B \&?
lists the current key bindings in the current window; up and down may be used
to navigate the list or
.Ql Q
to exit from it.
.Sh KEY BINDINGS
.Nm
may be controlled from an attached client by using a key combination of a
prefix, 
.Ql ^B
(ctrl-B) by default, followed by a command key.
.Pp
Some of the default key bindings include:
.Pp
.Bl -tag -width Ds -compact
.It Ql d
Detach current client.
.It Ql c
Create new window.
.It Ql n
Change to next window in the current session.
.It Ql p
Change to previous window in the current session.
.It Ql l
Move to last (previously selected) window in the current session.
.It Ql \&?
List current key bindings.
.El
.Pp
A complete list may be obtained with the
.Ic list-keys
command (bound to
.Ql \&? 
by default). Key bindings may be changed with the
.Ic bind-key
and
.Ic unbind-key
commands.
.Sh HISTORY
.Nm
maintains a configurable history buffer for each window.
By default, up to 2000 lines are kept, this can be altered with the
.Ic history-limit
option (see the
.Ic set-option
command below).
.Sh MODES
A
.Nm
window may be in one of several modes.
The default permits direct access to the terminal attached to the window.
The others are:
.Bl -tag -width Ds
.It Em output mode
This is entered when a command which produces output, such as
.Ic list-keys ,
is executed from a key binding.
The
.Ql up ,
.Ql down ,
.Ql page-up
and 
.Ql page-down
keys or
.Xr vi 1
style
.Ql j
and
.Ql k
keys may be used to scroll the output up and down.
The
.Ql q
key will exit output mode.
.It Em scroll mode
This is entered with the
.Ic scroll-mode
command (bound to
.Ql =
by default) and permits the window history buffer to be inspected.
In addition to the commands supported by output mode, the left and right arrow
keys, or
.Ql h
and
.Ql l ,
will scroll left and right.
.It Em copy mode
This permits a section of a window or its history to be copied to the
.Em paste buffer
for later insertion into another window.
The navigation keys move the cursor around the window, scrolling as necessary.
In addition,
.Ql ^A
and
.Ql ^E
(or the 
.Xr vi 1
style 
.Ql 0
and
.Ql $
keys) move to the start and end of the line; the space key begins a selection; 
and the enter key or
.Ql ^W
copies the selection to the paste buffer and exits copy mode.
.Pp
This mode is entered with the
.Ic copy-mode
command, bound to
.Ql [ 
by default.
.El
.Sh COMMANDS
This section contains a list of the commands supported by
.Nm .
There are some flags shared by several commands; these are:
.Bl -tag -width "XXXXXXXXXXXX"
.It Fl c Ar client-tty
Apply command to the client on the given tty.
Clients may be listed with the
.Ic list-clients
command.
.It Fl s Ar session-name
Apply command to the session named
.Ar session-name .
If it is omitted and
.Nm
is invoked from a running
.Nm
client, the session containing the client is connected to will be used;
otherwise, if only one session exists, it is chosen, or if multiple sessions
exist, an error is generated.
.El
.Pp
The following commands are available:
.Bl -tag -width Ds
.It Xo Ic attach-session
.Op Fl d
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic attach )
Create a new client in the current terminal and attach it to a session.
If
.Fl d
is specified, any other clients attached to the session are detached.
.It Xo Ic bind-key
.Ar key Ar command Op Ar arguments
.Xc
.D1 (alias: Ic bind )
Bind key
.Ar key
to
.Ar command .
.It Xo Ic copy-mode
.Op Fl s Ar session-name
.Xc
Enter copy mode.
.It Xo Ic detach-client
.Op Fl c Ar client-tty
.Xc
.D1 (alias: Ic detach )
Detach the current client if bound to a key, or the specified client with
.Fl c .
.It Xo Ic has-session 
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic has )
Report an error and exit with 1 if the specified session does not exist. If it
does exist, exit with 0.
.It Xo Ic kill-server
.Xc
Kill the
.Nm
server and clients and destroy all sessions.
.It Xo Ic kill-session
.Op Fl s Ar session-name
.Xc
Destroy the given session, closing any windows linked to it and no other
sessions, and detaching all clients attached to it.
.It Xo Ic kill-window 
.Op Fl i Ar index
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic killw )
Kill the current window or the window at
.Ar index ,
removing it from any sessions to which it is linked.
.It Xo Ic last-window 
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic last )
Select the last (previously selected) window.
.It Xo Ic link-window 
.Op Fl dk
.Op Fl i Ar index
.Op Fl s Ar session-name
.Ar source-name Ar source-index
.Xc
.D1 (alias: Ic linkw )
Link the window at
.Ar source-index
in session
.Ar source-name
into the specified session. If
.Ar index
is specified and no window exists with that index, the window is linked at
that index.
If 
.Fl k
is given and a window exists at
.Ar index ,
it is killed, otherwise an error is generated.
If
.Fl d
is given, the newly linked window is not selected.
.It Xo Ic list-clients 
.Xc
.D1 (alias: Ic lsc )
List all clients attached to the server.
.It Xo Ic list-keys 
.Xc
.D1 (alias: Ic lsk )
List all key bindings.
.It Xo Ic list-sessions 
.Xc
.D1 (alias: Ic ls )
List all sessions managed by the server.
.It Xo Ic list-windows
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic lsw )
List all windows.
.It Xo Ic new-session
.Op Fl d
.Op Fl n Ar window-name
.Op Fl s Ar session-name
.Op Ar command
.Xc
.D1 (alias: Ic new )
Create a new session with name
.Ar session-name .
The new session is attached to the current terminal unless
.Fl d
is given.
.Ar window-name
and
.Ar command
are the name of and command to execute in the initial window.
.It Xo Ic new-window 
.Op Fl d
.Op Fl i Ar index
.Op Fl n Ar name
.Op Fl s Ar session-name
.Op Ar command
.Xc
.D1 (alias: Ic neww )
Create a new window. If
.Fl d
is given, the session does not make the new window the current window.
.Ar index
and
.Ar name
are the index of the new window in the session and the name of the new window.
.Ar command
is the command to execute.
If
.Ar index
is not specified, the first free index is used.
If
.Ar command
is not specified, the default command is used.
.Pp
The
.Ev TERM
environment variable must be set to
.Dq screen
for all programs running
.Em inside
.Nm .
New windows will automatically have
.Dq TERM=screen
added to their environment, but care must be taken not to reset this in shell
start-up files.
.It Xo Ic next-window
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic next )
Move to the next window in the session.
.It Xo Ic paste-buffer
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic paste )
Insert the contents of the paste buffer into the current window.
Ignored unless executed via a key binding.
.It Xo Ic previous-window 
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic prev )
Move to the previous window in the session.
.It Xo Ic refresh-client
.Op Fl c Ar client-tty
.Xc
.D1 (alias: Ic refresh )
Refresh the current client if bound to a key, or a single client if one given
with
.Fl c .
.It Xo Ic rename-session
.Op Fl s Ar session-name
.Ar new-name
.Xc
.D1 (alias: Ic rename )
Rename the session to
.Ar new-name .
.It Xo Ic rename-window
.Op Fl i Ar index
.Op Fl s Ar session-name
.Ar new-name
.Xc
.D1 (alias: Ic renamew )
Rename the current window, or the window at
.Ar index
if specifed, to
.Ar new-name .
.It Xo Ic scroll-mode
.Op Fl s Ar session-name
.Xc
Enter scroll mode.
.It Xo Ic select-window 
.Op Fl s Ar session-name
.Op Fl i Ar index
.Xc
.D1 (alias: Ic selectw )
Select the window at
.Ar index .
.It Xo Ic send-keys 
.Op Fl c Ar client-tty
.Ar key Ar ...
.Xc
Send a key or keys to a window.
Each argument
.Ar key
is the name of the key (such as
.Ql ^A
or
.Ql npage
) to send; if the string is not recognised as a key, it is sent as a series of
characters.
All arguments are sent sequentially from first to last.
.It Xo Ic send-prefix
.Op Fl c Ar client-tty
.Xc
Send the prefix key to a window as if it was pressed.
.It Xo Ic set-option
.Ar option Ar value
.Xc
.D1 (alias: Ic set )
Set an option. Possible options are:
.Bl -tag -width Ds
.It Ic prefix Ar key
Set the current prefix key.
.It Ic history-limit Ar lines
Set the maximum number of lines held in window history.
This setting applies only to new windows - existing window histories are not
resized and retain the limit at the point they were created.
.It Xo Ic status 
.Op Ic on | Ic off
.Xc
Show or hide the status line.
.It Ic status-fg Ar colour
Set status line foreground colour, where
.Ar colour
is one of:
.Ic black ,
.Ic red ,
.Ic green ,
.Ic yellow ,
.Ic blue ,
.Ic magenta ,
.Ic cyan ,
.Ic white
or
.Ic default .
.It Ic status-bg Ar colour
Set status line background colour.
.It Xo Ic bell-action
.Op Ic any | Ic none | Ic current
.Xc
Set action on window bell.
.Ic any
means a bell in any window linked to a session causes a bell in the current
window of that session,
.Ic none
means all bells are ignored and
.Ic current
means only bell in windows other than the current window are ignored.
.It Ic default-command Ar command
Sets the command used for new windows (if not specified when the window is
created) to
.Ar command .
The default is
.Dq exec $SHELL .
.El
.It Xo Ic start-server
.Xc
Start the
.Nm
server, if not already running, without creating any sessions.
.It Xo Ic swap-window 
.Op Fl i Ar index
.Op Fl s Ar session-name
.Ar source-name Ar source-index
.Xc
.D1 (alias: Ic swapw )
This is similar to
.Ic link-window ,
except the source and destination windows are swapped.
It is an error if no window exists at
.Ar index .
.It Xo Ic unbind-key
.Ar key
.Xc
.D1 (alias: Ic unbind )
Unbind the key bound to
.Ar key .
.It Xo Ic unlink-window
.Op Fl i Ar index
.Op Fl s Ar session-name
.Xc
.D1 (alias: Ic unlinkw )
Unlink the window at
.Ar index .
A window may be unlinked only if it is linked to multiple sessions - windows may
not be linked to no sessions.
.El
.Sh SEE ALSO
.Xr pty 4
.Sh AUTHORS
.An Nicholas Marriott Aq nicm@users.sourceforge.net