osx_vnc.sh

#!/bin/bash

# /System/Library/CoreServices/Screen Sharing.app
# https://ss64.com/osx/kickstart.html
# https://apple.stackexchange.com/questions/30238/how-to-enable-os-x-screen-sharing-vnc-through-ssh

SWITCH=${1:-on}
[[ "$SWITCH" == "on" ]] && {
  echo "Enter VNC PASS"
  read -s VNCPASS
  export PARAM="-clientopts -setvnclegacy -vnclegacy yes -clientopts -setvncpw -vncpw "$VNCPASS" \
    -restart -agent -privs -all -users $USER"
} || {
  SWITCH="off"
  export PARAM=""
}

sudo /System/Library/CoreServices/RemoteManagement/ARDAgent.app/Contents/Resources/kickstart \
  -deactivate -configure -access -${SWITCH} ${PARAM}