I installed gulp(globally) and it looks like it worked because it ran this code:
├── tildify@0.2.0
├── interpret@0.3.5
├── pretty-hrtime@0.2.1
├── deprecated@0.0
I had this problem with getting "command not found" after install but I was installed into /usr/local as described in the solution above.
My problem seemed to be caused by me running the install with sudo. I did the following.