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Index: head/usr.bin/hexdump/hexdump.1
===================================================================
--- head/usr.bin/hexdump/hexdump.1
+++ head/usr.bin/hexdump/hexdump.1
@@ -28,7 +28,7 @@
.\" @(#)hexdump.1 8.2 (Berkeley) 4/18/94
.\" $FreeBSD$
.\"
-.Dd October 29, 2014
+.Dd June 29, 2020
.Dt HEXDUMP 1
.Os
.Sh NAME
@@ -242,8 +242,7 @@
Nonprinting characters are displayed as a single
.Dq Cm \&. .
.It Cm _u
-Output US
-.Tn ASCII
+Output US ASCII
characters, with the exception that control characters are
displayed using the following, lower-case, names.
Characters greater than 0xff, hexadecimal, are displayed as hexadecimal
@@ -330,18 +329,59 @@
.Sh EXIT STATUS
.Ex -std hexdump hd
.Sh EXAMPLES
-Display the input in perusal format:
+Dump input in canonical (hex+ASCII) form:
.Bd -literal -offset indent
+$ echo "FreeBSD: The power to serve" | hexdump -C
+00000000 46 72 65 65 42 53 44 3a 20 54 68 65 20 70 6f 77 |FreeBSD: The pow|
+00000010 65 72 20 74 6f 20 73 65 72 76 65 0a |er to serve.|
+0000001c
+.Ed
+.Pp
+Same as above but skipping the first 4 bytes of stdin and interpreting only 3
+bytes of input:
+.Bd -literal -offset indent
+$ echo "FreeBSD: The power to serve" | hexdump -C -s 4 -n 3
+00000004 42 53 44 |BSD|
+00000007
+.Ed
+.Pp
+Assuming a format file named
+.Pa format.txt
+with the following contents that specify a perusal format:
+.Bd -literal -offset indent
"%06.6_ao " 12/1 "%3_u "
"\et\et" "%_p "
"\en"
.Ed
.Pp
-Implement the \-x option:
+Dump input in canonical form using the format in
+.Pa format.txt :
.Bd -literal -offset indent
+$ echo "FreeBSD" | hexdump -f format.txt -C
+000000 F r e e B S D lf F r e e B S D .
+00000000 46 72 65 65 42 53 44 0a |FreeBSD.|
+00000008
+.Ed
+.Pp
+Assuming a format file named
+.Pa format.txt
+with the following contents that simulate the
+.Fl x
+option:
+.Bd -literal -offset indent
"%07.7_Ax\en"
"%07.7_ax " 8/2 "%04x " "\en"
.Ed
+.Pp
+Dump input in canonical form using the format in
+.Pa format.txt :
+.Bd -literal -offset indent
+$ echo "FreeBSD: The power to serve" | hexdump -f format.txt -C
+0000000 7246 6565 5342 3a44 5420 6568 7020 776f
+00000000 46 72 65 65 42 53 44 3a 20 54 68 65 20 70 6f 77 |FreeBSD: The pow|
+0000010 7265 7420 206f 6573 7672 0a65
+00000010 65 72 20 74 6f 20 73 65 72 76 65 0a |er to serve.|
+0000001c
+.Ed
.Sh SEE ALSO
-.Xr gdb 1 ,
.Xr od 1

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