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6
  • busybox's version of grep doesn't support -R. It does support -r. Commented Nov 14, 2015 at 21:21
  • On some directories grep complains grep: Permission denied. Please clarify about 2> /dev/null redirection, where this need be specified? Also, the target strings need be inside quotation marks? Commented Nov 15, 2015 at 0:49
  • As i said permission denied means you need sudo to read those directories. So append sudo before grep command. 2> /dev/null sends errors to null device ,ie they wont be displayed. Example, compare ls thisfiledoesnt exist and ls thisfie doesn't exist >/dev/null Commented Nov 15, 2015 at 0:53
  • It's hard to edit my answer on mobile. Ill edit it in 15 mins when i get to my laptop Commented Nov 15, 2015 at 0:57
  • Edited answer, please review Commented Nov 15, 2015 at 1:47