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    <h3>New post on september 2016!</h3> <p>As this is very specific, this add will be presented at very bottom of this.</p> <h3>Upgrade for adding specific bash version (with bashisms)</h3> <p>With new version of <code>printf</code> built-in, you could do a lot without having to fork (<code>$(...)</code>) making so your script a lot faster.</p> <p>First let see (by using <code>seq</code> and <code>sed</code>) how to parse <em>hd output</em>:</p> <pre><code>echo ;sed &lt;(seq -f %02g 0 $[COLUMNS-1]) -ne ' /0$/{s/^\(.*\)0$/\o0337\o033[A\1\o03380/;H;}; /[1-9]$/{s/^.*\(.\)/\1/;H}; ${x;s/\n//g;p}';hd &lt; &lt;(echo Hello good world!) 0 1 2 3 4 5 6 7 012345678901234567890123456789012345678901234567890123456789012345678901234567 00000000 48 65 6c 6c 6f 20 67 6f 6f 64 20 77 6f 72 6c 64 |Hello good world| 00000010 21 0a |!.| 00000012 </code></pre> <p>Were hexadecimal part begin at col 10 and end at col 56, spaced by 3 chars and having one extra space at col 34.</p> <p>So parsing this could by done by:</p> <pre><code>while read line ;do for x in ${line:10:48};do printf -v x \\%o 0x$x printf $x done done &lt; &lt;( ls -l --color | hd ) </code></pre> <h3>Old original post</h3> <p><strong>Edit 2</strong> for Hexadecimal, you could use <code>hd</code></p> <pre><code>echo Hello world | hd 00000000 48 65 6c 6c 6f 20 77 6f 72 6c 64 0a |Hello world.| </code></pre> <p>or <code>od</code></p> <pre><code>echo Hello world | od -t x1 -t c 0000000 48 65 6c 6c 6f 20 77 6f 72 6c 64 0a H e l l o w o r l d \n </code></pre> <p>shortly</p> <pre><code>while IFS= read -r -n1 car;do [ "$car" ] &amp;&amp; echo -n "$car" || echo ; done </code></pre> <p>try them:</p> <pre><code>while IFS= read -rn1 c;do [ "$c" ]&amp;&amp;echo -n "$c"||echo;done &lt; &lt;(ls -l --color) </code></pre> <p>Explain:</p> <pre><code>while IFS= read -rn1 car # unset InputFieldSeparator so read every chars do [ "$car" ] &amp;&amp; # Test if there is ``something''? echo -n "$car" || # then echo them echo # Else, there is an end-of-line, so print one done </code></pre> <p><strong>Edit</strong>; Question was edited: need hex values!?</p> <pre><code>od -An -t x1 | while read line;do for char in $line;do echo $char;done ;done </code></pre> <p>Demo:</p> <pre><code>od -An -t x1 &lt; &lt;(ls -l --color ) | # Translate binary to 1 byte hex while read line;do # Read line of HEX pairs for char in $line;do # For each pair printf "\x$char" # Print translate HEX to binary done done </code></pre> <p>Demo 2: <strong>We have both hex and binary</strong></p> <pre><code>od -An -t x1 &lt; &lt;(ls -l --color ) | # Translate binary to 1 byte hex while read line;do # Read line of HEX pairs for char in $line;do # For each pair bin="$(printf "\x$char")" # translate HEX to binary dec=$(printf "%d" 0x$char) # translate to decimal [ $dec -lt 32 ] || # if caracter not printable ( [ $dec -gt 128 ] &amp;&amp; # change bin to a single dot. [ $dec -lt 160 ] ) &amp;&amp; bin="." str="$str$bin" echo -n $char \ # Print HEX value and a space ((i++)) # count printed values if [ $i -gt 15 ] ;then i=0 echo " - $str" str="" fi done done </code></pre> <h2>New post on september 2016:</h2> <p>This could be usefull on very specific cases, ( I've used them to manualy copy GPT partitions between two disk, at low level, without having <code>/usr</code> mounted...)</p> <h1>Yes, bash could read binary!</h1> <p>... but only one byte, by one... (because `char(0)' couldn't be correctly read, the only way of reading them correctly is to consider <em>end-of-file</em>, where if no caracter is read and end of file not reached, then character read is a char(0)).</p> <p>This is more a proof of concept than a relly usefull tool: there is a <strong><em>pure <a href="/questions/tagged/bash" class="post-tag" title="show questions tagged &#39;bash&#39;" rel="tag">bash</a></em></strong> version of <code>hd</code> (hexdump).</p> <p>This use recent <em>bashisms</em>, under <code>bash v4.3</code> or higher.</p> <pre><code>#!/bin/bash printf -v ascii \\%o {32..126} printf -v ascii "$ascii" printf -v cntrl %-20sE abtnvfr values=() todisplay= address=0 printf -v fmt8 %8s fmt8=${fmt8// / %02x} while LANG=C IFS= read -r -d '' -n 1 char ;do if [ "$char" ] ;then printf -v char "%q" "$char" ((${#char}==1)) &amp;&amp; todisplay+=$char || todisplay+=. case ${#char} in 1|2 ) char=${ascii%$char*};values+=($((${#char}+32)));; 7 ) char=${char#*\'\\};values+=($((8#${char%\'})));; 5 ) char=${char#*\'\\};char=${cntrl%${char%\'}*}; values+=($((${#char}+7)));; * ) echo &gt;&amp;2 ERROR: $char;; esac else values+=(0) fi </code></pre> <h1> </h1> <pre><code> if [ ${#values[@]} -gt 15 ] ;then printf "%08x $fmt8 $fmt8 |%s|\n" $address ${values[@]} "$todisplay" ((address+=16)) values=() todisplay= fi done if [ "$values" ] ;then ((${#values[@]}&gt;8))&amp;&amp;fmt="$fmt8 ${fmt8:0:(${#values[@]}%8)*5}"|| fmt="${fmt8:0:${#values[@]}*5}" printf "%08x $fmt%$(( 50-${#values[@]}*3-(${#values[@]}&gt;8?1:0) ))s |%s|\n" $address ${values[@]} ''""'' "$todisplay" fi printf "%08x (%d chars read.)\n" $((address+${#values[@]})){,} </code></pre> <p>You could try/use this, but don't try to compare performances!</p> <pre><code>time hd &lt; &lt;(seq 1 10000|gzip)|wc 1415 25480 111711 real 0m0.020s user 0m0.008s sys 0m0.000s time ./hex.sh &lt; &lt;(seq 1 10000|gzip)|wc 1415 25452 111669 real 0m2.636s user 0m2.496s sys 0m0.048s </code></pre> <p>same job: 20ms for <code>hd</code> vs 2000ms for my <code>bash script</code>.</p> <p>... but if you wanna read 4 bytes in a file header or even a <em>sector address</em> in an hard drive, this could do the job...</p>
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