Transform hexadecimal information to binary using a Linux command
130,698
As @user786653 suggested, use the xxd(1)
program:
xxd -r -p input.txt output.bin
Author by
Udit Gupta
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Updated on August 12, 2020Comments
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Udit Gupta almost 4 years
I have this binary file on my Linux system...
udit@udit-Dabba ~ $ cat file.enc Salted__s�bO��<0�F���Jw!���]�:`C�LKȆ�l
Using the hexdump command, I see its information like this:
udit@udit-Dabba ~ $ hexdump -C file.enc 00000000 53 61 6c 74 65 64 5f 5f 1b 73 a1 62 4f 15 be f6 |Salted__.s.bO...| 00000010 3c 30 cc 46 ee 10 13 11 84 bf 4a 77 21 a4 84 99 |<0.F......Jw!...| 00000020 0e 5d ef 11 18 3a 60 43 a0 4c 4b 1e c8 86 e6 6c |.]...:`C.LK....l| 00000030
Now I am given a file on some other system whose contents are like this:
53 61 6c 74 65 64 5f 5f 1b 73 a1 62 4f 15 be f6 3c 30 cc 46 ee 10 13 11 84 bf 4a 77 21 a4 84 99 0e 5d ef 11 18 3a 60 43 a0 4c 4b 1e c8 86 e6 6c
And I need to find out that same exact binary information from this hexdump.
How can I proceed for that?
If there isn't any switch for that then C code will also work fine.
(But a Linux command with some switch is preferable)
Limitation:
The binary information in the file is output of an encryption algorithm, so contents should exactly match...
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Amanpreet over 6 yearsto add use
echo "hex" | xxd -r -p -
to take input from piped standard out -
xdevs23 about 6 yearsCan also be used to get binary hashes - like
echo something | sha256sum | xxd -r -p -
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Alexander over 2 yearsTo explain the flags: explainshell.com/explain?cmd=xxd+-r+-p
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Michael Firth over 2 yearsNote that
xxd
uses very old fashioned argument processing, so all of the following behave differently:xxd -rp
xxd -pr
xxd -r -p
. Only the last of the three works for this use case.