Disassembler
Disassembling is the inverse action of assembling. Rasm2 takes hexpair as an input (but can also take a file in binary form) and show the human readable form.
To do this we can use the -d option of rasm2 like this:
$ rasm2 -a x86 -b 32 -d '90'
nop
or for java:
$ rasm2 -a java 'nop'
00
Rasm2 also have the `-D` flag to show the disassembly like `-d` does, but includes offset and bytes.
In radare2 there are many commands to perform a disassembly from a specific place in memory.
```console
$ rasm2 -a x86 -b 32 'mov eax, 33'
b821000000
$ echo 'push eax;nop;nop' | rasm2 -f -
509090
You might be interested in trying if you want different outputs for later parsing with your scripts, or just grep to find what you are looking for:
pd N
Disassemble N instructions
pD N
Disassemble N bytes
pda
Disassemble all instructions (seeking 1 byte, or the minimum alignment instruction size), which can be useful for ROP
pi, pI
Same as pd and pD, but using a simpler output.