+.B \-i
+The case of letters is ignored in making comparisons.
+(E.g. upper and lower case are considered identical.)
+(\fIgrep\fR\| only)
+.TP
+.B \-s
+Silent mode.
+Nothing is printed (except error messages).
+This is useful for checking the error status.
+.TP
+.B \-w
+The expression is searched for as a word
+(as if surrounded by `\e<' and `\e>', see
+.IR ex (1).)
+(\fIgrep\fR\| only)
+.TP