SERVER:Thu Aug 27:10:20:B> ls
index.php
SERVER:Thu Aug 27:10:20:B> vi index.php
SERVER:Thu Aug 27:11:13:B> vi sampler.txt
SERVER:Thu Aug 27:11:14:B> xxd -b sampler.txt
0000000: 01100001 01100010 01100011 01100100 01100101 01100110  abcdef
0000006: 01100111 01101000 01101001 01101010 01101011 01101100  ghijkl
000000c: 01101101 01101110 01101111 01110000 01110001 01110010  mnopqr
0000012: 01110011 01110101 01110100 01110101 01110110 01110111  sutuvw
0000018: 01111000 01111001 01111010 00001010 01000001 01000010  xyz.AB
000001e: 01000011 01000100 01000101 01000110 01000111 01001000  CDEFGH
0000024: 01001001 01001010 01001011 01001100 01001101 01001110  IJKLMN
000002a: 01001111 01010000 01010001 01010010 01010011 01010101  OPQRSU
0000030: 01010100 01010101 01010110 01010111 01011000 01011001  TUVWXY
0000036: 01011010 00001010 00110000 00110001 00110010 00110011  Z.0123
000003c: 00110100 00110101 00110110 00110111 00111000 00111001  456789
0000042: 00110000 00100001 01000000 00100011 00100100 00100101  0!@#$%
0000048: 01011110 00100110 00101010 00101000 00101001 01011111  ^&*()_
000004e: 00101011 00001010                                      +.
SERVER:Thu Aug 27:11:14:B> xxd -b sampler.txt > real.txt
SERVER:Thu Aug 27:11:15:B> vi real.txt
SERVER:Thu Aug 27:11:17:B> c

SERVER:Thu Aug 27:11:19:B> vi index.php
SERVER:Thu Aug 27:11:31:B> python
Python 2.7.5 (default, Sep 26 2019, 13:23:47) 
[GCC 4.8.5 20150623 (Red Hat 4.8.5-39)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 0o123
83
>>> int("123", 8)
83
>>> 0xFF
255
>>> 454
454
>>> int("454", 2)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: invalid literal for int() with base 2: '454'
>>> bin(454)
'0b111000110'
>>> hex(454)
'0x1c6'
>>> oct(454)
'0706'
>>> 
SERVER:Thu Aug 27:11:59:B> ls
index.php  real.txt  sampler.txt
SERVER:Thu Aug 27:11:59:B>