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hexdump(1): Add EXAMPLES section

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* Add examples showing the use of -f, -C, -s, -n
 * Rework the two already present examples that were *format* examples
 * Remove .Tn suggested by mandoc(1)
 * Remove reference to gdb(1) since it is not present in current

Approved by:	manpages (gbe)
Differential Revision:	https://reviews.freebsd.org/D25406
This commit is contained in:
Fernando Apesteguía 2020-06-29 15:15:14 +00:00
parent 4e22eafc99
commit ac2adfb86d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362783
1 changed files with 46 additions and 6 deletions
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52
usr.bin/hexdump/hexdump.1
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@ -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 @@ Output characters in the default character set.
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 @@ option.
.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