Node-browserify isn't producing any output

I installed node-browserify globally using npm install browserify -g, but the module isn't working as I expected. After installation, I tried running the command browserify entry.js -o entryBrowserfied.js in the same folder as entry.js, but the command doesn't generate a JavaScript file in the same directory as entry.js, and doesn't produce any console output either. How can I generate "browserified" modules from commonJS modules, now that this command doesn't seem to be working?

The full console output (with the commands that I've entered) is shown below:

anderson@anderson-Ideapad-Z560 ~/Dropbox/JavaScript projects/fractal-replacement-images/requireJS_modules $ browserify entry.js -o entryBrowserfied.js
anderson@anderson-Ideapad-Z560 ~/Dropbox/JavaScript projects/fractal-replacement-images/requireJS_modules $

I'm still not sure why this command isn't generating a file from entry.js as described in the documentation.