need a shell script to convert big endian to little endian

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I need a shell script program to print the hexadecimal number from big endian to little endian

For example
  • Input: my virtual address = 00d66d7e
  • Output: 7e6dd600

How can I can I create this in a bash script?

For 32 bit addresses, assuming it's zero padded:

v=00d66d7e 
echo ${v:6:2}${v:4:2}${v:2:2}${v:0:2}
# 7e6dd600

need a shell script to convert big endian to little endian, I need a shell script program to print the hexadecimal number from big endian to little endian For example Input: my virtual address = 00d66d7e Output:� convert between little and big Endian is impossible for 4 byte integers using a shell script. Is this true? So one can't possibly look for a whitepace and count the number of bytes and use 'dd' for 2 byte integers and something else for 4 byte? Does anyone have a script for converting 4 byte integers? Kenneth

Based on Karoly's answer you could use following script, reading piped input:

#!/bin/bash

# check stdin
if [ -t 0 ]; then exit; fi

v=`cat /dev/stdin`
i=${#v}

while [ $i -gt 0 ]
do
    i=$[$i-2]
    echo -n ${v:$i:2}
done

echo

For e.g. you could save this script as endian.sh and make it executable with:

chmod u+x endian.sh

Then:

echo 00d66d7e | ./endian.sh

gives you:

7e6dd600

For a different length string:

echo d76f411475428afc90947ee320 | ./endian.sh

result would be:

20e37e9490fc8a427514416fd7

Is there a oneliner that converts a binary file from little endian to big , You cannot do this because for such a conversion, you need to know the meaning of the binary content. If e.g. there is a string inside a binary file it must not be� I need a shell script program to print the hexadecimal number from big endian to little endian. For example. Input: my virtual address = 00d66d7e Output: 7e6dd600 How can I can I create this in a bash script?

Just had to do this... but from decimal to little endian.. adapting that here:

echo 00d66d7e | tac -rs .. | echo "$(tr -d '\n')"

achieves the desired result, for arbitrarily sized hexadecimal representations of unsigned integers.

(h/t 'tac -rs' MestreLion, very nice!)

endian(3) - Linux manual page, htobe32, htole32, be32toh, le32toh, htobe64, htole64, be64toh, le64toh - convert values between host and big-/little-endian byte order� 10 need a shell script to convert big endian to little endian 6 Cartesian product of two files (as sets of lines) in GNU/Linux View more network posts →

This works for dash (and many other shells) :

v=0x12345678
v2=$(( (v<<8 & 0xff00ff00) | (v>>8 & 0xff00ff) ))
v2=$(( (v2<<16 & 0xffff0000) | v2>>16 ))
printf '0x%08x\n' $v2

Result should be "0x78563412"

${v:6:2} is for bash.

Is there a utility like hexdump that will handle non-native endian-ness?, It can be any of the following, which you will notice have the same meanings as they 16-bit, little-endian n or S> - unsigned 16-bit, big-endian L - unsigned 32- bit, native it as a pipe you would need to write a wrapper script that creates temporary files. It's part of the Linux Standard Base, and in my opinion it's better than� These functions convert the byte encoding of integer values from the byte order that the current CPU (the "host") uses, to and from little- endian and big-endian byte order. The number, nn, in the name of each function indicates the size of integer handled by the function, either 16, 32, or 64 bits.

This script is for flipping 16 bit data.

#!/bin/bash

if [ -t 0 ]; then exit; fi

data=`cat /dev/stdin | od -An -vtx1 | tr -d ' ' | tr -d '\n'`
length=${#data}

i=0
while [ $i -lt $length ]; do
    echo -n -e "\x${data:$[$i+2]:2}"
    echo -n -e "\x${data:$[$i]:2}"
    i=$[$i+4]
done

Endian Conversion - UNIX and Linux Forums, It is urgent. I have to precise something HP-UX is a big Endian System TRU-64 is a little Endian System.. Big-endian UCS2 is the same as AL16UTF16. So, if your data was created on a big-endian system, there is no need to convert that data: it's already in AL16UTF16 without any effort on your part. But if you are converting little-endian UCS2 CLOBS to a big-endian system, there will be a need to convert the CLOB to the big-endian AL16UTF16.

Conversion of big endian data from Unix to little endian data, Currently we have migrated data from Unix linux. The data in Unix is in Big endian byte structure. Where are as Linux (suse linux) byte structure� My library needs to read-in big-endian integers (4-bytes) and convert them to the endian order of the host for processing. While on *nix ntohl has worked a treat under Windows use of ntohl requires the use of Ws2_32.dll (Winsock). Such a dependency is one which I would rather eliminate.

kernel - Little Endian to Big Endian Conversion, You cannot change it, it is a hardware property. Big endian machines are IBM mainframes for example. In the the past SPARC processors and� The value is of type FILETIME - A 64-bit time value (Hex Value, Little Endian) representing the number of 100-nanosecond intervals since midnight UTC, 1 Jan 1601. Is this possible via shell (bash)? I would like to implement it in a shell script.

Little-endian-to-Big-endian Conversion (IA-32), Derived data types are disabled. Command lines for variable setting with different shells: Shell. Command Line. Sh. I checked the od man page, and found you could over-ride that with the options --endian=big and --endian=little. So this command should convert your whole file of floats into ascii text. paul $ od --endian=big -A n -t fF float5 -9.61577e+09 4.6006e-41 -4.284436e+08 0 3.9375e-41

Comments
  • looks like simple string manipulation.
  • Why don't show what you have tried? Stackoverflow is not for request. It is for answering questions
  • Also, what does C relate to the shell? And what shell?
  • Possible duplicate of Command-line to reverse byte order/change endianess. Also see How to reverse the byte order of an 8-byte string in Perl?.
  • How to change the script to make it work with ./endian.sh d76f411475428afc90947ee320? Thanks!
  • @Freewind my answer addresses your request
  • very clever solution, +1! May I suggest an improvement? tac, or at least GNU tac, accepts a regex as separator, so grep is not needed: echo "AABBCC" | tac -rs ..
  • note, the unusual echo "$()" mechanism it basically just to get a newline at the end... could replace with { tr -d '\n'; echo; } or some such.
  • Very nice solution. I'd prefer echo -n 00d66d7e | tac -rs .. ; echo but that's just taste I guess.