cn(1) BSD General Commands Manual cn(1)NAME
cn, — Command line interface to CommonNumerics routines.
SYNOPSIS
cn, [-p prompt] [command] [command_options] [command_args]
DESCRIPTION
A simple command line utility allowing you to perform CRC and Base
Encode/Decode with the Common Numerics functions.
cn, has the following standard options for all sub-commands:
-h Show help information.
-a Use the specified algorithm. The CRC, Encode, and Decode
commands have various algorithms that can be used on data
provided to them.
-s -<string> Performs the operation on the specified string value.
-v Function in Verbose mode.
CN COMMAND SUMMARY
cn, currently only provides functions for two activities: CRC calculation
and Base Encoding and Decoding (base16, base32, base64).
Here are brief descriptions of all the cn, commands:
crc Perform a CRC on the data provided either as a string or
on stdin.
Algorithms
10 - kCN_CRC_8
11 - kCN_CRC_8_ICODE
12 - kCN_CRC_8_ITU
13 - kCN_CRC_8_ROHC
14 - kCN_CRC_8_WCDMA
20 - kCN_CRC_16
21 - kCN_CRC_16_CCITT_TRUE
22 - kCN_CRC_16_CCITT_FALSE
23 - kCN_CRC_16_USB
24 - kCN_CRC_16_XMODEM
25 - kCN_CRC_16_DECT_R
26 - kCN_CRC_16_DECT_X
27 - kCN_CRC_16_ICODE
28 - kCN_CRC_16_VERIFONE
29 - kCN_CRC_16_A
30 - kCN_CRC_16_B
31 - kCN_CRC_16_Fletcher
40 - kCN_CRC_32_Adler
41 - kCN_CRC_32
42 - kCN_CRC_32_CASTAGNOLI
43 - kCN_CRC_32_BZIP2
44 - kCN_CRC_32_MPEG_2
45 - kCN_CRC_32_POSIX
46 - kCN_CRC_32_XFER
60 - kCN_CRC_64_ECMA_182
Encode|Decode Encode or Decode data provided either as a string or on
stdin using one of the algorithms specified below.
Algorithms
1 - kCNEncodingBase64
2 - kCNEncodingBase32
3 - kCNEncodingBase32Recovery
4 - kCNEncodingBase32HEX
5 - kCNEncodingBase16
ENVIRONMENT
CN_READ_SIZE The "read size" to use when processing incoming data.
CN_WIDTH The number of columns in which to output data when perform‐
ing a base encoding. The default is 64 columns.
HISTORY
cn, was introduced in Mac OS X version 10.9 and iOS version 7.0.
Darwin April 19, 2024 Darwin
