I did the very same thing, and asked about it on SO too! https://stackoverflow.com/questions/54658932/grep-v-f-of-empty-file-different-between-script-and-comman

I did the very same thing, and asked about it on SO too! https://stackoverflow.com/questions/54658932/grep-v-f-of-empty-file-different-between-script-and-command-line-on-os-x https://stackoverflow.com/questions/54658932/grep-v-f-of-emp...