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sed: accept and ignore -E and -r flags for unix compatibility

--- a/sys/src/cmd/sed.c

+++ b/sys/src/cmd/sed.c

@@ -239,6 +239,8 @@

 	case 'u':

 		uflag++;

 		continue;

+	case 'E': case 'r':	/* unix compat */

+		continue;

 	default:

 		quit("Unknown flag: %c", ARGC());

 	} ARGEND

-- 

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