A bash script simplifying the procedure of sharing tmux session between users

tmux-share.sh

#!/bin/bash
cmds=('new' 'join' 'list')
socket="/tmp/tmux-share"
grp="ggparty"
bin=tmux-share
usage0="tmux-share ${cmds[0]} <name>"
usage1="tmux-share ${cmds[1]} [<name>]"
usage2="tmux-share ${cmds[2]}"
usage="Usage:\n$usage0\n$usage1\n$usage2"

if [[ $# == 0 ]]; then
    echo -e $usage
    exit 1
fi

cmd=$1
name=$2
tmx="tmux -S $socket"
if [[ "$cmd" == ${cmds[0]} ]]; then
    # new
    if [[ $# < 2 ]]; then
        echo -e "Usage: $usage0"
        exit 1
    fi
    $tmx new -s $name -d
    chgrp $grp $socket
elif [[ "$cmd" == ${cmds[1]} ]]; then
    if [[ $name != '' ]]; then
        $tmx attach -t $name
    else
        $tmx attach
    fi
elif [[ "$cmd" == ${cmds[2]} ]]; then
    $tmx list-session
else
    echo -e $usage
    exit 1
fi