On 6/29/2013 11:34 AM, Stephen Powell wrote: > I have a need to pad a binary file with some character > (probably a null character) so that its total length > is a multiple of some number. For example, I have a file > called kernel.debian, whose size is 6319616 bytes. I need > to pad it with nulls until its length is a multiple of 80. > The next higher multiple of 80 is 6319680, which can be > obtained by padding the file with 64 null characters. > In CMS, the FBLOCK CMS Pipelines stage will do the trick. > For example, > > PIPE < KERNEL DEBIAN A1 | FBLOCK 80 00 | > KERNEL1 DEBIAN A1 F > > This will create an output file with fixed-length 80-byte > records, padded as necessary at the end with null characters, > so that all records are exactly 80 bytes long. > > I am looking for a way to do this padding in Linux. > A search of the internet using the keywords "pad file Linux" > did not seem to produce any useful results. Does anyone know > how to accomplish this?
One possibility might be ~$ cat file1 file2 >> file3 where file1 is your binary and file2 contains 64 nulls. Now you simply need to create a file containing exactly 64 nulls. I've never screwed with this, but I'd guess it can be done with one of the scripting languages, maybe a text manipulator such as awk or its variants, etc. Loop a print command with the proper special character syntax for null 64 times piping the output to file2. You may even be able to create it in vi. -- Stan -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/51cf2474.50...@hardwarefreak.com
