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I did the following to try and get Byobu to work (see https://stackoverflow.com/questions/19099018/byobu-error-sessions-should-be-nested-with-care-unset-tmux-to-force ) on a Ubuntu server droplet I rent from Digital Ocean but it didn't fix my problem.

TMUX= ''

I would now like to revert it to it's original setting but do not know what the default should be. Is anyone able to advise?

I'm hoping I am correct in thinking this is the appropriate location to post this even though the original question I link to above is from the StackOverflow site.

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1 Answer 1

Reset to default
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Logging in again should get you the value back in the new session. If you did this in a sub-shell, exiting the sub-shell should reveal the original value. You may be able to find the original value with grep. Try the commands:

grep TMUX= ~/.??*
find /etc -type f | xargs grep TMUX=

Setting $TMUX='' may create an empty variable with the name specified by the TMUX variable. The commands TMUX='' or unset TMUX will clear the TMUX variable. The command echo TMUX=\"$TMUX\" will echo a command you can use to restore the value to its current value.

When doing this kind of thing I recommend creating a backup variable like this:

TMUX_OLD="$TMUX"
$TMUX=''

You can then restore the value with the command:

TMUX="$TMUX_OLD"

EDIT: It may be possible to find the correct value in the environment of the parent process. This may be readable using the command:

cat /proc/$PPID/environ | tr '\0' '\n'
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  • Sorry I have edited my question, I did not use the dollar sign when entering the original command so I did in fact un-set the TMUX variable. In which case, am I right in thinking I just need to enter the command returned from your "echo..." suggestion? Or can I just do TMUX=\"$TMUX\" without having to replace $TMUX with its actual value? Commented Jan 2, 2014 at 14:34
  • @drewstiff just open a new terminal, the command you ran should only have affected the shell you had opened. Commented Jan 2, 2014 at 14:51
  • If I end my session and re-start it and I try the command BYOBU I should get my original error of "ERROR: Sessions should be nested with care. Unset $TMUX to force" but instead it goes in to an unusable byobu session. This is how I know it has not reverted my changes to how they were before I started messing with things. Commented Jan 2, 2014 at 15:11
  • That last comment was in reply to @terdon sorry Commented Jan 2, 2014 at 15:20
  • @drewstiff - just include the user who you want to direct a comment to, like I did. Commented Jan 2, 2014 at 15:31

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