gulp%20watch%20'gulp'%20is%20not%20recognized%20as%20an%20internal%20or%20external%20command,%20operable%20program%20or%20batch%20file. code example
Example: use gulp
npm init // create the package.json file
npm install -g gulp //If you haven't installed gulp globally before
npm install --save-dev gulp // --save-dev dependancy package.json
npm install --save-dev gulp-sass
npm install --save-dev gulp-print
your commands > gulpfile.js
gulp command