Tmux: variables sharing between sessions

tmux

I've noticed that

tmux will share variable between sessions.
tmux will increment TMUX_PANE for new session as well.

Is it possible to reset VAR for each session?

Is it possible to start TMUX_PANE from 0 for each session?

# set variable
# create 2 sessions
$ export VAR=aaaaa
$ tmux new -A -s $VAR -d

$ export VAR=bbbbb
$ tmux new -A -s $VAR -d

$ tmux ls
aaaaa: 1 windows (created Fri Jan 23 12:12:46 2015) [207x50]
bbbbb: 1 windows (created Fri Jan 23 12:12:55 2015) [207x50]

# connect to sessions
# check value of variable
$ tmux att -t aaaaa
$ echo $VAR
aaaaa

$ tmux att -t bbbbb
$ echo $VAR
aaaaa            <-------- i would like to see 'bbbbb' here

Best Answer

I've found workaround.

Multiple servers with -L option (which specifies socket name).

# set variable
# create 2 sessions
$ export VAR=aaaaa
$ tmux -L $VAR new -A -s $VAR -d

$ export VAR=bbbbb
$ tmux -L $VAR new -A -s $VAR -d

$ tmux ls
failed to connect to server
$ tmux -L aaaaa ls
aaaaa: 1 windows (created Fri Jan 23 12:12:46 2015) [207x50]
$ tmux -L bbbbb ls
bbbbb: 1 windows (created Fri Jan 23 12:12:55 2015) [207x50]

# connect to sessions
# check value of variable
$ tmux -L aaaaa att -t aaaaa
$ echo $VAR
aaaaa

$ tmux -L bbbbb att -t bbbbb
$ echo $VAR
bbbbb            <-------- now i can see 'bbbbb' here

Related Solutions

N equivalent of GNU Screen’s “log” command in tmux

Let me see if I have deciphered your screen configuration correctly:

You use something like logfile "%t-screen.log" (probably in a .screenrc file) to configure the name of the log file that will be started later.
You use the title <hostname> (C-a A) screen command to set the title of a new window, or
you do screen -t <hostname> ssh0 <hostname> to start a new screen session.
You use the C-a H (C-a :log) screen command to toggle logging to the configured file.

If so, then is nearly equivalent (requires tmux 1.3+ to support #W in the pipe-pane shell command; pipe-pane is available in tmux 1.0+):

In a configuration file (e.g. .tmux.conf):

bind-key H pipe-pane -o "exec cat >>$HOME/'#W-tmux.log'"

Use tmux rename-window <hostname> (C-b ,) to rename an existing window, or
use tmux new-window -n <hostname> 'ssh <hostname>' to start a new tmux window, or
use tmux new-session -n <hostname> 'ssh <hostname>' to start a new tmux session.
Use C-b H to toggle the logging.

There is no notification that the log has been toggled, but you could add one if you wanted:

bind-key H pipe-pane -o "exec cat >>$HOME/'#W-tmux.log'" \; display-message 'Toggled logging to $HOME/#W-tmux.log'

Note: The above line is shown as if it were in a configuration file (either .tmux.conf or one you source). tmux needs to see both the backslash and the semicolon; if you want to configure this from the a shell (e.g. tmux bind-key …), then you will have to escape or quote both characters appropriately so that they are delivered to tmux intact. There does not seem to be a convenient way to show different messages for toggling on/off when using only a single binding (you might be able to rig something up with if-shell, but it would probably be ugly). If two bindings are acceptable, then try this:

bind-key H pipe-pane "exec cat >>$HOME/'#W-tmux.log'" \; display-message 'Started logging to $HOME/#W-tmux.log'
bind-key h pipe-pane \; display-message 'Ended logging to $HOME/#W-tmux.log'

Tmux equivalent of “screen -D -R”

Yes:

$ tmux attach -d || tmux new

-d is necessary to behave like screen -D, ie, detach everybody else.

Connect by ssh, then attach or create could be something like:

$ cat bin/stmux
#!/bin/sh
exec ssh -t $@ 'tmux attach -d || tmux new'

$ stmux my.remote.box

Best Answer

Related Solutions

N equivalent of GNU Screen’s “log” command in tmux

Tmux equivalent of “screen -D -R”

Related Question