For future reference here is how I got it working on Ubuntu with default shell.
Add this to ~/.bashrc
file:
if [ -f $HOME/.aliases-zt ]; then
source $HOME/.aliases-zt
fi
Add this to ~/.aliases-zt
file:
alias ztjoin-evilcorp='sudo zerotier-cli join XXXXXXXXXXXXXXXX'
alias ztleave-evilcorp='sudo zerotier-cli leave XXXXXXXXXXXXXXXX'
alias ztjoin-othercorp='sudo zerotier-cli join YYYYYYYYYYYYYYYY'
alias ztleave-othercorp='sudo zerotier-cli leave YYYYYYYYYYYYYYYY'