radare2 reverse engineering framework: rax2

rax2 utility comes along with the radare2 framework, and it's a simple conversion utility, it can convert between binary, decimal, hex, string, etc... You can find examples in the help menu for each option:

root@kali:~# rax2 -h
Usage: rax2 [options] [expression]
  int   ->  hex           ;  rax2 10
  hex   ->  int           ;  rax2 0xa
  -int  ->  hex           ;  rax2 -77
  -hex  ->  int           ;  rax2 0xffffffb3
  int   ->  bin           ;  rax2 b30
  bin   ->  int           ;  rax2 1010d
  float ->  hex           ;  rax2 3.33f
  hex   ->  float         ;  rax2 Fx40551ed8
  oct   ->  hex           ;  rax2 35o
  hex   ->  oct           ;  rax2 Ox12 (O is a letter)
  bin   ->  hex           ;  rax2 1100011b
  hex   ->  bin           ;  rax2 Bx63
  -e    swap endianness   ;  rax2 -e 0x33
  -b    binstr -> bin     ;  rax2 -b 01000101 01110110
  -s    hexstr -> bin     ;  rax2 -s 43 4a 50
  -S    bin -> hexstr     ;  rax2 -S C  J  P
  -v    version           ;  rax2 -V
  -x    hash string       ;  rax2 -x linux osx
  -k    keep base         ;  rax2 -k 33+3 -> 36
  -h    help              ;  rax2 -h

E.g.:

root@kali:~# rax2 0x33
51
root@kali:~# rax2 Fx33
51.000000f
root@kali:~# rax2 -b 01000101 01110110
Ev
root@kali:~# rax2 -s 43 4a 50
CJP
root@kali:~#