grep is described as 'command-line utility for searching plain-text data sets for lines matching a regular expression' and is an app in the File Management category. There are more than 25 alternatives to grep for a variety of platforms, including Windows, Mac, Linux, BSD and PortableApps.com. The best alternative is DocFetcher, which is both free and Open Source. Other great apps like grep are Agent Ransack (Freemium), grepWin (Free, Open Source), dnGREP (Free, Open Source) and AstroGrep (Free, Open Source).
DocFetcher is a portable German/English open source desktop search application. It allows you search the contents of documents on your computer. - You can think of it as Google for your local document repository.
Agent Ransack is a tool for finding files and information on your hard drive fast and efficiently. When searching the contents of files Agent Ransack also displays the text found. Users can then quickly browse the results without having to separately open each file!
grepWin is a simple search and replace tool which can use PCRE regular expressions to search for strings of text within files. grepWin adds an entry to the shell context menu to easily search selected folders.
AstroGrep is A Microsoft Windows GUI File Searching (grep) utility. Features include regular expressions, versatile printing options, stores most recent used paths and has a "context" feature which is very nice for looking at source code.
regexxer is a nifty GUI search/replace tool featuring Perl-style regular expressions. If you need project-wide substitution and you’re tired of hacking sed command lines together, then you should definitely give it a try.
Ack is designed as a standalone (one perl file) replacement for 99% of the uses of grep. ack is intelligent about the files it searches. It knows about certain file types, based on both the extension on the file and, in some cases, the contents of the file.
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ack vs grep opinions
pros, cons and recent comments
DesertShadow SO much simpler. Sane, modern, defaults.
Quickly search through large numbers of files on your PC or network using powerful text patterns to find exactly the information you want. Search and replace with plain text or regular expressions to maintain web sites, source code, reports, ...