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ack vs GNU Grep: catalog facts
ack	GNU Grep
Best for: Programmers searching large source trees from the terminal	Best for: Searching text and logs with regular expressions in scripts and the terminal
Free Free and open source.	Free Free software from the GNU Project with no paid tier.
Windows, macOS, Linux, Command line	Linux, Command line
Built for searching source code rather than general text Full Perl regular expressions All 3 strengths for ack Built for searching source code rather than general text Full Perl regular expressions Boolean --and, --or and --not options	Installed by default on most Linux systems Thorough documentation via man, info and online manual All 3 strengths for GNU Grep Installed by default on most Linux systems Thorough documentation via man, info and online manual Long-maintained with active mailing lists
Needs a Perl interpreter Newer tools such as ripgrep are typically faster on very large trees	Slower on large codebases than tools like ripgrep or ugrep Does not skip ignored files or directories by default
Downloadable app	Downloadable app
Open source	Open source
License: Artistic-2.0	License: GPL-3.0-or-later
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for ack beyondgrep.com Catalog checked September 23, 2026	Official website Full listing and sources Sources for GNU Grep gnu.org/software/grep Catalog checked October 1, 2026

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