Update od(1)-documentation

od.1

@@ -1,4 +1,4 @@
-.Dd 2015-10-08
+.Dd 2015-10-09
 .Dt OD 1
 .Os sbase
 .Sh NAME
@@ -6,28 +6,34 @@
 .Nd octal dump
 .Sh SYNOPSIS
 .Nm
-.Op Fl A Ar d|o|x|n
-.Op Fl t Ar a|c|d|o|u|x
+.Op Fl A Ar addrformat
+.Op Fl t Ar outputformat...
 .Op Fl v
-.Op Ar file...
+.Op Ar file ...
 .Sh DESCRIPTION
 .Nm
 writes an octal dump of each
 .Ar file
 to stdout.  If no
 .Ar file
-is given, then
+is given
 .Nm
 reads from stdin.
 .Sh OPTIONS
 .Bl -tag -width Ds
-.It Fl A Ar d|o|x|n
-Display the address in base \fId\fRecimal | \fIo\fRctal |
-he\fIx\fRadecimal | \fIn\fRone.  If unspecified, the default is octal.
-.It Fl t Ar a|c|d|o|u|x
-Display the content as n\fIa\fRmed character, \fIc\fRharacter, signed
+.It Fl A Ar addressformat
+.Ar addressformat
+is one of d|o|x|n and sets the address to be
+either in \fId\fRecimal, \fIo\fRctal, he\fIx\fRadecimal or \fIn\fRot
+printed at all.  The default is octal.
+.It Fl t Ar outputformat
+.Ar outputformat
+is a list of a|c|d|o|u|x followed by a digit or C|S|I|L and sets
+the content to be in n\fIa\fRmed character, \fIc\fRharacter, signed
 \fId\fRecimal, \fIo\fRctal, \fIu\fRnsigned decimal, or
-he\fIx\fRadecimal.  If unspecified, the default is octal.
+he\fIx\fRadecimal format, processing the given amount of bytes or the length
+of \fIC\fRhar, \fIS\fRhort, \fII\fRnteger or \fIL\fRong.
+The default is octal with 4 bytes.
 .It Fl v
 Always set. Write all input data, including duplicate lines.
 .El

od.c

@@ -165,7 +165,8 @@ lcm(unsigned int a, unsigned int b)
 static void
 usage(void)
 {
-	eprintf("usage: %s", argv0);
+	eprintf("usage: %s [-A addressformat] [-t outputformat] "
+	        "[-v] [file ...]\n", argv0);
 }
 
 int