$ git clone https://github.com/chp-lab/gcrok.git
Then save gcrok token only first time!
$ node ./gcrok.js --add-authtoken <your_gcrok_token>
e.g. 
$ node ./gcrok.js --add-authtoken abcdefghijklmnopqrstuvwxyz
First Option (via bash, git bash)  This must edit .env to matches with your setup:
$ npm run start-gcrok.sh
Ready to access your services!!

Or Secound Option (More flexibilities)
Save gcrok token only first time!
$ node ./gcrok.js --add-authtoken <your_gcrok_token>
Then start your gcrok tunnel
$ node ./gcrok.js --port <service_port> --subdomain <your_sub_domain>
$ node ./gcrok.js --port 3000 --subdomain my-sub-domain
Or edit .env file then
$ node ./gcrok.js
Note: subdomain cannot contain special character (~, _. ! @ etc.) Dash - is allow

Or Third Option (More Reliable) This gcrok pm2 will restart always and prevent gcrok down; 
provide non-stop tunnels for your services!. This must edit .env to matches with your setup.
$ node ./gcrok.js --add-authtoken <your_gcrok_token>
(sudo) $ npm install pm2 -g
$ pm2 start gcrok-pm2.json
Done!
======
Optionals:
$ pm2 startup 
->  auto start on boot

$ pm2 save    
->  save current state of pm2        

$ pm2 status  
-> list pm2 services

$ pm2 logs gcrok  
-> view pm2 logs of gcrok services

Mac: https://chp-s3.s3.ap-south-1.amazonaws.com/gcrok_releases/macOS/mac.zip
Windows: https://chp-s3.s3.ap-south-1.amazonaws.com/gcrok_releases/windows/windows.zip
Linux: https://chp-s3.s3.ap-south-1.amazonaws.com/gcrok_releases/linux/linux.zip
Download via wget: 
$ wget https://chp-s3.s3.ap-south-1.amazonaws.com/gcrok_releases/macOS/mac.zip

Edit .env file to your setup
PORT=<service port number>
SUBDOMAIN=<your sub-domain>

Save gcrok token only first time!
$ node ./gcrok.js --add-authtoken <your_gcrok_token>
Then start gcrok with
$ ./gcrok

You can start gcrok binary via specific options instead of .env via:
Mac:    $ ./gcrok --port <service_port> --subdomain <your_sub_domain>
e.g.    $ ./gcrok --port 3000 --subdomain my-sub-domain
Windows:$ ./gcrok-windows --port 3000 --subdomain my-sub-domain
Linux:  $ ./gcrok-linux --port 3000 --subdomain my-sub-domain

It's also support global running by set gcrok path to your environment variable.
MAC and Linux: 
$ export PATH="$PATH:<your_gcrok_directory>"
e.g. export PATH="$PATH:$HOME/gcrok"
You can permanently export PATH by edit ~/.bashrc file by:
$ nano ~/.bashrc
Scroll to the last line and add
export PATH="$PATH:<your_gcrok_directory>"
e.g. export PATH="$PATH:$HOME/gcrok"
$ source ~/.bashrc
##### Complete ######

Windows: Add gcrok directory to environtment varible PATH. Re-open command windows.

$ PORT=3000 ./gcrok ...