Inserting a conditional RUN statement inside a dockerfile

Question

I am trying to write a docker file which will run a RUN command to search for a word in a package.json file and act upon it:

this is my simple dockerfile:

Answer 1

Just like when typing at the shell, you need either a newline or a semicolon before fi:

RUN if grep -q "grunt" package.json; then echo succeed; fi
                                             add this ^