Exclude or Include certain profile lines during a tmux session start

Question

In my .bash_profile, I have a line to start tmux only if it is present on the system with:

[ -z $TMUX ] && export TERM=xterm-256color && exec tmux

In a similar vein, I would like to skip or include certain lines:

• Have certain lines in my .bash_profile that only run during a tmux session start.

• Have certain lines in my .bash_profile that do not run during a tmux session start.

What would the syntax be to achieve this?

Reda Salih · Accepted Answer · 2020-11-14 23:33:55Z

It's wrong because -z will return true if the environment variable have an empty value. So you have to use instead :

[ ! -z $TMUX ] && export TERM=xterm-256color && exec tmux

Where the exclamation (!) mark negate the conditional test.

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