Using XXD Command in Linux

Want a Hexadecimal dump (a hexadecimal view) of your data? The xxd command can do that for you.

Like any other normal command, it takes data from the standard input or file and gives hexadecimal output. It can also do the opposite and convert hex to normal characters.

And in this tutorial, I will walk you through different examples of how to use the xxd command in Linux.

Install XXD on your Linux system

The xxd utility is not pre-installed in most Linux distributions but can easily be installed with the default package manager.

For Ubuntu/Debian base:

sudo apt install xxd

For Fedora/RHEL base:

sudo dnf install vim-common

For Arch-based distros:

sudo pacman -S xxd

How to use the XXD command in Linux

Once you are done with the installation, you have to follow the given command syntax to use the xxd command:

xxd [options] [file]

To make things easy to understand, I will be using the file named Sample.txt throughout the tutorial, which contains the following:

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To create a hex dump of the Sample.txt file, I will be using the following command:

xxd Sample.txt

Sure, you can use different options to tweak the default behavior of the xdd command. Let me show you how.

Trim lines in xxd output

The xxd command allows you to trim down lines from your output.

To do so, you will have to use the -s flag and append how many initial lines you want to skip:

xxd -s [lines_to_skip] Filename

So let's say you want to start the hex dumping from the 5th line, which means you need to trim down the first 4 lines:

xxd -s 0x40 Sample.txt

And as you can see, it trimmed the first 4 lines and gave me the hex dump starting from the 5th line.

But if you want to get the hex dump of the last few lines, you can do that too!

To get the hex dump of the last n number of the lines, you will have to execute the xxd command in the following manner:

xxd -s -[Last_n_lines] Filename

So let's say I want to get the hex dump of the last 3 lines, then, I will be using the following:

xxd -s -0x30 Sample.txt

Specify the column length

You may want to specify how many columns should be shown instead of what xxd gets you by default (10).

To do so, you will need to use the -c flag and append how many columns should be displayed on the output:

xxd -c [No_of_columns] Filename

Let's say I want the output in 4 columns, then I will be using the following:

xxd -c 4 Sample.txt

Specify the output length

It is similar to what I explained in how you can trim the output but here, you can specify how many lines of the output you want from the first line.

To specify the output length, all you have to do is use the -l flag and specify how many lines of output you want:

xxd -l [Output_length_in_lines] Filename

So let's say I only want the first 5 lines of the hex dump, then I will be using the following:

xxd -l 0x50 Sample.txt

Get binary output instead of hexadecimal

The xxd command also allows you to get output in binary instead of hexadecimal!

It is quite simple and the binary output can be achieved using the -b flag:

xxd -b Filename

Here, I converted my text file Sample.txt to binary:

xxd -b Sample.txt

Get hex output in capital letters

You may find situations where you want the output in capital letters.

And you can easily get the hex output in capital letters using the -u flag as shown:

xxd -u Filename

Convert hex to the normal text again

So if you redirected the output of the hex to a file, there is a way to get back to normal quite easily.

For your reference, I'm redoing the whole process of how you can redirect the output of the hex dump to the text file first:

So I saved the hex dump output to the Hex.txt.

Now, if I want to read the content of the Hex.txt, I will have to perform the conversion. Otherwise, it is just a pain in the head.

To reverse this effect, you will have to use the -r flag in shown manner:

xxd -r Filename

Want to convert Hexadecimal to ASCII? Here you go!

If you want to convert hex string to ASCII, we have a detailed guide for that purpose:

Convert Hex to ASCII Characters in Linux Bash Shell

Here are various ways for converting Hex to ASCII characters in the Linux command line and bash scripts.

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I hope you will find this guide helpful.

And if you have any queries, let me know in the comments.