You can be a good developer and not know bash. Bash is, in some ways, programming horror. But SQL is pretty fundamental. It's a thing onto itself. There are plenty of shells and shell-like languages but there is really only one SQL.
wrt to shells - the combination of find/grep/sed/awk for locating and transforming textual data makes for its own kind of extremely powerful query language. I've always valued being able to think in pipelines made up of these tools.
