Re: Utility to change a byte in a binary file?
On 8/10/07, Erik Osterholm [EMAIL PROTECTED] wrote: On Thu, Aug 09, 2007 at 06:02:54PM -0400, Jerry McAllister wrote: On Thu, Aug 09, 2007 at 08:25:17PM +, V.I.Victor wrote: It sure seems that this should be simple, but my searches have only turned up inter-active hex/disk editors. I'm probably asking wrong. I have a large binary file (700 meg) and I know that there is a single wrong byte. I also know it's exact location in the file. jerry If you use vim, you can do this using vim and xxd: http://www.vim.org/htmldoc/usr_23.html#23.4 Using vim is one way to do it and in case you are not familiar with vi/vim you can use xxd on the command line to change your binary file into text, edit the byte you want to change (since you know the byte to be changed) and reconvert back to binary. % xxd infile outfile_txt edit the outfile using your favorite editor (assuming it will take the big file) % xxd -r outfile_txt fixed_infile That should do it too. Raj ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Utility to change a byte in a binary file?
On Thu, Aug 09, 2007 at 06:02:54PM -0400, Jerry McAllister wrote: On Thu, Aug 09, 2007 at 08:25:17PM +, V.I.Victor wrote: It sure seems that this should be simple, but my searches have only turned up inter-active hex/disk editors. I'm probably asking wrong. I have a large binary file (700 meg) and I know that there is a single wrong byte. I also know it's exact location in the file. Is there a command-line utility to write a byte at a specified offset into a file? You could try 'dd' and manipulate the skip/offset and size arguments. jerry If you use vim, you can do this using vim and xxd: http://www.vim.org/htmldoc/usr_23.html#23.4 Skip down to the section entitled USING XXD. Don't forget to convert it back before you save! Erik ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Utility to change a byte in a binary file?
On Thu, 09 Aug 2007 20:25:17 + V.I.Victor [EMAIL PROTECTED] wrote: It sure seems that this should be simple, but my searches have only turned up inter-active hex/disk editors. I'm probably asking wrong. I have a large binary file (700 meg) and I know that there is a single wrong byte. I also know it's exact location in the file. Is there a command-line utility to write a byte at a specified offset into a file? Hello Victor, editors/bpatch and editors/hexcurse are what you want. Both work great with large files. Nikola Lečić ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Utility to change a byte in a binary file?
On Thu, Aug 09, 2007 at 08:25:17PM +, V.I.Victor wrote: It sure seems that this should be simple, but my searches have only turned up inter-active hex/disk editors. I'm probably asking wrong. I have a large binary file (700 meg) and I know that there is a single wrong byte. I also know it's exact location in the file. Is there a command-line utility to write a byte at a specified offset into a file? You could try 'dd' and manipulate the skip/offset and size arguments. jerry ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
