Beyond grep: ack 2.12, a source code search tool for programmersack is a grep-like source code search tool. The latest version of ack is v3.9.0, released 2025-05-26. Changelog for v3.9.0 Designed for programmers with large heterogeneous trees of source code, ack is written in portable Perl 5 and takes advantage of the power of Perl's regular expressions. What's new in ack? New boolean options --and, --or and --not The new repeatable --and, --or and --not optio
