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#From: "dennis" <dennis@netstrata.com>
#To: <bash-maintainers@gnu.org>
#Subject: New example script: bash-hexdump
#Date: Mon, 4 Jan 2010 22:48:19 -0700
#Message-ID: <6dbec42d$64fcdbd2$4a32cf2d$@com>
#I've written a script that functions like "hexdump -C" or "hd". If you'd
#like to include it in a future distribution of example Bash scripts, I have
#included it here:
#!/bin/bash
# bash-hexdump# pure Bash, no externals
# by Dennis Williamson - 2010-01-04
# in response to
http://stackoverflow.com/questions/2003803/show-hexadecimal-numbers-of-a-file
# usage: bash-hexdump file
saveIFS="$IFS"
IFS="" # disables interpretation of \t, \n and space
saveLANG="$LANG"
LANG=C # allows characters > 0x7F
bytecount=0
valcount=0
printf "%08x " $bytecount
while read -d '' -r -n 1 char # -d '' allows newlines, -r allows \
do
((bytecount++))
# for information about the apostrophe in this printf command, see
# http://www.opengroup.org/onlinepubs/009695399/utilities/printf.html
printf -v val "%02x" "'$char"
echo -n "$val "
((valcount++))
if [[ "$val" < 20 || "$val" > 7e ]]
then
string+="." # show unprintable characters as a dot
else
string+=$char
fi
if (( bytecount % 8 == 0 )) # add a space down the middle
then
echo -n " "
fi
if (( bytecount % 16 == 0 )) # print 16 values per line
then
echo "|$string|"
string=''
valcount=0
printf "%08x " $bytecount
fi
done < "$1"
if [[ "$string" != "" ]] # if the last line wasn't full, pad it out
then
length=${#string}
if (( length > 7 ))
then
((length--))
fi
(( length += (16 - valcount) * 3 + 4))
printf "%${length}s\n" "|$string|"
printf "%08x " $bytecount
fi
echo
LANG="$saveLANG";
IFS="$saveIFS"
exit 0
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