+.B \-\-output\-format
+option.
+.TP
+.BR "\-O, \-\-output\-format " <formatname>
+Set the output format to use. Use the
+.B \-V
+option to see a list of available output formats. The format name may
+optionally be followed by a colon-separated list of options, where each
+option takes the form
+.BR "key=value" .
+.sp
+Supported formats currently include
+.BR bits ,
+.BR hex ,
+.BR ascii ,
+.BR binary ,
+.BR vcd ,
+.BR ols ", and"
+.BR gnuplot .
+.sp
+The
+.B bits
+or
+.B hex
+formats, for an ASCII bit or ASCII hexadecimal display, can take a "width" option, specifying the number of samples (in bits) to display per line. Thus
+.B hex:width=128
+will display 128 bits per line, in hexadecimal:
+.sp
+ 1:ffff ffff ffff ffff ffff ffff ffff ffff
+ 2:ff00 ff00 ff00 ff00 ff00 ff00 ff00 ff00
+.sp
+The lines always start with the probe number (or name, if defined), followed by a colon. If no format is specified, it defaults to
+.BR bits:width=64 ,
+like this:
+.sp
+ 1:11111111 11111111 11111111 11111111 [...]
+ 2:11111111 00000000 11111111 00000000 [...]