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* grep: fix bug with '... | grep pat >> /dev/null'Paul Eggert2016-12-271-0/+2
* tests: use "returns_" rather than "$?"Paul Eggert2016-11-191-2/+1
* grep: scale back /dev/null speedupPaul Eggert2016-11-191-1/+2
* tests: standardize on 10-second timeouts to avoid rare false failureJim Meyering2016-08-061-1/+1
* grep: /dev/null output speedupPaul Eggert2016-05-011-0/+11