The best replacement for findstr is find.

The best alternatives to findstr are rated as following:
★★★★★  find
★★★★  grep
★★  strfind

Your alternative for findstr is not listed? Suggest!
Speaking about findstr, one probably shouldn't forget about multiple strings.

Other search terms related to findstr and their ratings are:
★★★★★ multiple strings
★★★ errorlevel
★★ netstat
You have in mind a companion for findstr and it is not yet here? Propose!



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findstr
find
grep