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
-.TP
\fB-q\fR, \fB--no-beep\fR
make a flash instead of a beep when there is an edition error
.TP