lineswhich
Lineswhich is a hypothetical text-processing concept described as a lightweight utility and library for selecting lines from text data that satisfy a user-defined predicate. The name blends “lines” with the relative pronoun “which,” signaling line-by-line evaluation that defines the filter.
In its core model, lineswhich operates on a stream of lines, evaluating a predicate for each line
Usage typically involves a predicate specification and an input source. For example, lineswhich --predicate 'length(line) > 80'
Implementation and ecosystem notes suggest that lineswhich can be delivered as a standalone executable or as