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authorjohannst <johannes.stoelp@gmail.com>2020-04-19 22:13:44 +0200
committerjohannst <johannes.stoelp@gmail.com>2020-04-19 22:13:44 +0200
commitfef4d6ff2ad9f48e6dccde0f061453e6a3ac624e (patch)
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parent43e402ba2320ced7972d33c9442b2745afe230f6 (diff)
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-# od(1)
-
-```markdown
- od [opts] <file>
- -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 to hex string
-```markdown
- echo -n AAAABBBB | od -An -w4 -tx4
- >> 41414141
- >> 42424242
-
- echo -n '\x7fELF\n' | od -tx1 -ta -tc
- >> 0000000 7f 45 4c 46 0a # tx1
- >> del E L F nl # ta
- >> 177 E L F \n # tc
-```
-
-## Extract parts of file
-For example `.rodata` section from an elf file. We can use `readelf` to get the
-offset into the file where the `.rodata` section starts.
-```markdown
- 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
-```
-
-With the offset of `-j 0x0009c0` we can dump `-N 0x30` bytes from the beginning of
-the `.rodata` section as follows:
-```markdown
- od -j 0x0009c0 -N 0x30 -tx4 -w4 foo
- >> 0004700 00020001
- >> 0004704 00000000
- >> *
- >> 0004740 00000001
- >> 0004744 00000002
- >> 0004750 00000003
- >> 0004754 00000004
-```
-**Note**: Numbers starting with `0x` will be interpreted as hex by `od`.