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# binary
--------------------------------------------------------------------------------
# toc
------
|od|
|xxd|
# od(1) *od*
========
args:
-An don't print addr info
-tx4 print hex in 4 byte chunks
-ta print as named character
-tc printable chars or backslash escape
-w4 print 4 bytes per line
-j <n> skip <n> bytes from file, (hex if start with 0x)
-N <n> dump <n> bytes (hex of start with 0x)
## ascii chars to hex string
echo -n AAAABBBB | od -An -w4 -tx4
>> 41414141
>> 42424242
echo -n '\x7fELF\n' | od -tx1 -ta -tc
>> 0000000 7f 45 4c 46 0a
>> del E L F nl
>> 177 E L F \n
## extract part of file (eg .rodata section form ELF)
readelf -W -S foo
>> Section Headers:
>> [Nr] Name Type Address Off Size ES Flg Lk Inf Al
>> ...
>> [15] .rodata PROGBITS 00000000004009c0 0009c0 000030 00 A 0 0 16
od -j 0x0009c0 -N 0x30 -tx4 -w4 foo
>> 0004700 00020001
>> 0004704 00000000
>> *
>> 0004740 00000001
>> 0004744 00000002
>> 0004750 00000003
>> 0004754 00000004
# xxd(1) *xxd*
=========
args:
-p dump continuous hexdump
-r convert hexdump into binary ('revert')
-e dump as little endian mode
-i output as C array
## from ascii to hex stream
echo -n 'aabb' | xxd -p
>> 61616262
## from hex to binary stream
echo -n '61616262' | xxd -p -r
>> aabb
## ascii to binary
echo -n '\x7fELF' | xxd -p | xxd -r -p | file -p -
>> ELF
## ascii to C array (hex encoded)
xxd -i <(echo -n '\x7fELF')
>> unsigned char _proc_self_fd_11[] = {
>> 0x7f, 0x45, 0x4c, 0x46
>> };
>> unsigned int _proc_self_fd_11_len = 4;
--------------------------------------------------------------------------------
vim:ft=help:sts=2:et:tw=80:cc=80:fo+=t
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