\fB-a\fR, \fB--case-sensitive\fR
start in case sensitive mode
.TP
+\fB-u\fR, \fB--upper-case-makes-case-sensitive\fR
+using an upper case in the matching string makes the matching
+case-sensitive
+.TP
\fB-n\fR, \fB--exclamation-negates\fR
substrings starting with an exclamation mark must be absent for a line
to match