26.15. 進制轉換 - 16進制 - 8進制

26.15. 進制轉換 - 16進制 - 8進制 - 二進制
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26.15. 進制轉換 - 16進制 - 8進制 - 二進制

26.15.1. od - dump files in octal and other formats

26.15.1.1. 16進制

			
neo@netkiller ~ % echo "helloworld" | od -x
0000000      6568    6c6c    776f    726f    646c    000a                
0000013

neo@netkiller ~ % echo "helloworld" | od -x -An
             6568    6c6c    776f    726f    646c    000a

26.15.1.2. 使用 od 隨機生成密碼

			
neo@netkiller ~ % od  -vN 32 -An -tx1 /dev/urandom | tr -d ' \n'
a6bf6dad8ed860a234046b66d550008f61c36e9cb2630c22d935dac5e20d7920

26.15.2. hexdump, hd -- ASCII, decimal, hexadecimal, octal dump

以十六進制方式顯示二進制檔案

	
neo@netkiller ~ % hexdump -n 256 -C ./coutput/HelloWorld.bin
00000000  36 30 36 30 36 30 34 30  35 32 33 34 31 35 36 31  |6060604052341561|
00000010  30 30 30 66 35 37 36 30  30 30 38 30 66 64 35 62  |000f57600080fd5b|
00000020  36 31 30 32 65 33 38 30  36 31 30 30 31 65 36 30  |6102e38061001e60|
00000030  30 30 33 39 36 30 30 30  66 33 30 30 36 30 36 30  |00396000f3006060|
00000040  36 30 34 30 35 32 36 30  30 34 33 36 31 30 36 31  |6040526004361061|
00000050  30 30 34 63 35 37 36 30  30 30 33 35 37 63 30 31  |004c576000357c01|
00000060  30 30 30 30 30 30 30 30  30 30 30 30 30 30 30 30  |0000000000000000|
*
00000090  30 30 30 30 30 30 30 30  39 30 30 34 36 33 66 66  |00000000900463ff|
000000a0  66 66 66 66 66 66 31 36  38 30 36 33 34 65 64 33  |ffffff1680634ed3|
000000b0  38 38 35 65 31 34 36 31  30 30 35 31 35 37 38 30  |885e146100515780|
000000c0  36 33 36 64 34 63 65 36  33 63 31 34 36 31 30 30  |636d4ce63c146100|
000000d0  61 65 35 37 35 62 36 30  30 30 38 30 66 64 35 62  |ae575b600080fd5b|
000000e0  33 34 31 35 36 31 30 30  35 63 35 37 36 30 30 30  |341561005c576000|
000000f0  38 30 66 64 35 62 36 31  30 30 61 63 36 30 30 34  |80fd5b6100ac6004|
00000100

26.15.3. xxd - make a hexdump or do the reverse.

		
neo@MacBook-Pro ~/workspace % xxd -b netkiller.dat 
00000000: 00000000 00000000 00000000 11111111 00000000 00000000  ......
00000006: 00000000 00000000 11111111 11111111 11111111 11111111  ......

26.15.3.1. 指定每行的列數

			
neo@MacBook-Pro ~ % xxd -c 2 -b netkiller.bin
00000000: 10010110 01001000  .H

26.15.3.2. 跳過位元組

跳過兩個位元組，三列顯示

			
neo@MacBook-Pro ~ % xxd -s 2 -c 3 -b netkiller.txt
00000002: 11101001 10011001 10001000  ...
00000005: 11100110 10011001 10101111  ...
00000008: 11100101 10110011 10110000  ...

26.15.4. binutils

		
$ sudo apt-get install binutils

26.15.4.1. strings - print the strings of printable characters in files.

			
tcpdump -i eth0 -s 0 -l -w - dst port 80 | strings

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