'open' is not recognized as an internal or external command, operable program or batch file. code example

Example 1: 'ng' is not recognized as an internal or external command, operable program or batch file.

npm install -g @angular/cli

Example 2: 'source' is not recognized as an internal or external command, operable program or batch file.

env\Scripts\activate

Example 3: 'source' is not recognized as an internal or external command, operable program or batch file.

virtualenv env