Then do: find -name \*.pgn -print0 | xargs -0 grep -h "Result" Each grep invocation will consume a maximum number of arguments, and xargs will invoke the mini

Then do: find -name \*.pgn -print0 | xargs -0 grep -h "Result" Each grep invocation will consume a maximum number of arguments, and xargs will invoke the minimum number of greps to process everything, with no "args too long" errors.