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Welcome to tmux!
tmux is a "terminal multiplexer", it enables a number of terminals (or windows)
to be accessed and controlled from a single terminal. tmux is intended to be a
simple, modern, BSD-licensed alternative to programs such as GNU screen.
This release runs on OpenBSD, FreeBSD, NetBSD, Linux and OS X and may still
run on Solaris and AIX (although they haven't been tested in a while). It is
usable, although there remain a number of missing features and some remaining
bugs are expected.
If upgrading from 1.5, PLEASE NOTE:
- The word-separators window option is now a session option.
- The options used to change the window attributes when an alert occurs were
removed. Each kind of alert has its own individual set of options.
- The ability to have a list of prefix keys was dropped in favour of two
separate options, prefix and prefix2.
Since the 1.2 release that tmux depends on libevent. Download it from:
To build tmux from a release tarball, do:
$ ./configure && make
$ sudo make install
To build from a version control checkout, the configure script must be
generated by running:
$ sh
tmux consists of a server part and multiple clients. The server is created when
required and runs continuously unless killed by the user. Clients access the
server through a socket in /tmp. Multiple sessions may be created on a single
server and attached to a number of clients. Each session may then have a number
of windows and windows may be linked to a number of sessions. Commands are
available to create, rename and destroy windows and sessions; to attach and
detach sessions from client terminals; to set configuration options; to split
windows into several simultaneously displayed panes; and to bind and unbind
command keys (invoked preceded by a prefix key, by default ctrl-b). Please see
the tmux(1) man page for further information.
A more extensive, but rough, todo list is included in the TODO file.
tmux also depends on several features of the client terminal (TERM), if these
are missing it may refuse to run, or not behave correctly.
A Vim syntax file is available in the examples directory. To install it:
- Drop the file in the syntax directory in your runtimepath (such as
- Make the filetype recognisable by adding the following to filetype.vim
in your runtimepath (~/.vim/filetype.vim):
augroup filetypedetect
au BufNewFile,BufRead .tmux.conf*,tmux.conf* setf tmux
augroup END
- Switch on syntax highlighting by adding "syntax enable" to your vimrc file.
For debugging, running tmux with -v or -vv will generate server and client log
files in the current directory.
tmux mailing lists are available; visit:
Bug reports, feature suggestions and especially code contributions are most
welcome. Please send by email to:
This file and the CHANGES, FAQ and TODO files are licensed under the ISC
license. Files under examples/ remain copyright their authors unless otherwise
stated in the file but permission has been received to distribute them with
tmux. All other files have a license and copyright notice at their
start. Please contact me with any queries.
-- Nicholas Marriott <>
$Id: NOTES 2677 2012-01-23 12:38:05Z tcunha $