tmux: check if session is interactive

.bash_extra

@@ -12,6 +12,8 @@ source "${HOME}/dotfiles/.bash_ps1"
 # add my scripts to PATH
 PATH=$PATH:"${HOME}/dotfiles/scripts"
 
+## check interactive shell https://unix.stackexchange.com/questions/26676/how-to-check-if-a-shell-is-login-interactive-batch
+if [[ $- == *i* ]] ; then
   ### tmux auto attach
   # Check if the user ID is not 0 (root)
   if [ "$EUID" -ne 0 ]; then
@@ -20,6 +22,7 @@ if [ "$EUID" -ne 0 ]; then
       tmux attach -t default || tmux new -s default
     fi
   fi
+fi
 
 ### keychain
 eval "$(keychain -q --eval --timeout 60 --agents ssh,gpg)"