[Refactor] Use grep `-q` parameter instead of redirect to /dev/null
[Refactor] Use grep `-q` parameter instead of redirect to /dev/null

evocateur/nvm,edwmurph/nvm,ljharb/nvm,PeterDaveHello/nvm,PeterDaveHelloKitchen/nvm,edwmurph/nvm,creationix/nvm,creationix/nvm,PeterDaveHello/nvm,ljharb/nvm,evocateur/nvm,PeterDaveHelloKitchen/nvm