Single command to create/join a tmux session

tmuxx.sh

# Creates/joins a shared session using session groups (-t option).
# This simplifies making a shared group. Just invoke tmuxx from anywhere
# and it'll always join to the same, shared session.
#
# Parameters:
# $1  the name of the session group, defaults to 'main'
tmuxx () {
	local session="${1:-main}" 
	tmux new-session -t "$session"
}