IDEA: Delete first x bytes of a binary file

[Killeroid]

I have a folder full of binary files. The first 18 bytes of each file needs to be deleted. Maybe someone can help? Thanks in advance

[Killeroid]

Alright, I finally found a fix using bash and dd on linux.

Code: (bash)

#!/bin/bash
#Reads all files ending in specified extension in folder, deletes first X bytes and then saves the modified file as prefix.oldname
X=18                 #Number of bytes to delete from file
EXT=jpg             #File extension of files being modified
PREFIX=new       #The prefix prepended to the filename to after moifying the file

for file in $(echo *.$EXT); do dd ibs=$X skip=1 if=${file} of=$PREFIX.${file}; done

[f0dder]

Just out of curiosity: why do you need those 18 bytes (jpeg header?) deleted?

[Killeroid]

All the files were encoded wrongly before transit and when i got them, all of them had 18 bytes of junk prepended to each file.

[lanux128]

what is a good Windows CLI tool to delete malformed headers like the one Killeroid used?