reverse-hexdump.sh is a small shell/awk tool to reverse hexdump -C
output back to the original data. The command reads from standard input
or named files and writes to standard output.
reverse-hexdump.sh [FILE]... > DEST
Write a previous hexdump -C of an MSDOS partition table back to the
drive.
# cat msdos_table.txt
00000000 fa b8 00 10 8e d0 bc 00 b0 b8 00 00 8e d8 8e c0 |................|
00000010 fb be 00 7c bf 00 06 b9 00 02 f3 a4 ea 21 06 00 |...|.........!..|
00000020 00 be be 07 38 04 75 0b 83 c6 10 81 fe fe 07 75 |....8.u........u|
00000030 f3 eb 16 b4 02 b0 01 bb 00 7c b2 80 8a 74 01 8b |.........|...t..|
00000040 4c 02 cd 13 ea 00 7c 00 00 eb fe 00 00 00 00 00 |L.....|.........|
00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001b0 00 00 00 00 00 00 00 00 f3 6b 05 00 00 00 00 20 |.........k..... |
000001c0 21 00 83 24 23 41 00 08 00 00 00 f0 0f 00 00 00 |!..$#A..........|
000001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000001f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 55 aa |..............U.|
00000200
# reverse-hexdump.sh msdos_table.txt > /dev/sdb
# fdisk -l /dev/sdb
Disk /dev/sdb: 536 MB, 536330240 bytes, 1047520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00056bf3
Device Boot Start End Blocks Id System
/dev/sdb1 2048 1046527 522240 83 Linux