How to replace data with zeroes in the middle of a binary file?

Question

Is there a standard command for RedHat (except for the dd + truncate pair) for replacing data with zeros in the middle of a binary file?

if you need to replace all the characters, you can use the tr program (the octal 377 is decimal 255): $ cat файл1 | tr '\1-\377' '\0' > файл2
@avp, according to the description in turnips from bubunta, is a vim-like binary file editor.
I didn’t pick it myself, but I remembered that there was such a thing when I saw your question.
I thought, since dd and truncate mentioned in the question, it is obvious that we are talking about using it in the script (of course, if you wish, you can use the editor from the script)

Accepted Answer · 2017-12-07T21:19:21

You can use a one-liner in Python or another scripting language:

 python -c "f=open('some','r+b');f.seek(123);f.write('\0'*4);"

Abyx

23.5k 6 67 134

Is the resulting length stored? Check for files larger than 4k. - 0andriy
@ 0andriy, yes, everything is OK. And what is the reason for doubt? - avp
one
@avp should not open binary files in text mode. with open('file.bin', 'r+b') as f: f.seek(123); f.write(b'\0'*4) with open('file.bin', 'r+b') as f: f.seek(123); f.write(b'\0'*4) although for this dd sufficient. In zsh there is a sysseek. <> allows file to read and write to open. - jfs
Yes, of course it is better to open in binary mode - Abyx
@jfs, why? I tested in Ubuntu and RedHat. Works. - avp

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Hellseher hellseher 2,559 five 26 · Answer 2 · 2017-12-17T21:16:13

In the piggy bank.

Emacs supports working with binary files as with ordinary files:

 Mx hexl-find-file

open the file in hex format

CMd

insert byte in decimal format.

CMo

insert byte in hex format

CMx

insert byte in hexadecimal format

Links

You can also use the (quoted-insert) command (quoted-insert) usually attached to Ctrl-q ) by entering a byte code in the number system specified in the variable read-quoted-char-radix (default 8)

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