Mac: Command: MD5 & SHA1 & CRC-32 checksum

open the command terminal

MD5 checksum command: to get the MD5 hash of a file

md5 /path/to/file
eg:

$ md5 ~/Desktop/abc.dmg

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SHA1 checksum command:

shasum /path/to/file
eg:

$ shasum ~/Desktop/abc.dmg

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CRC-32 checksum command:

1. crc32 /path/to/file: to get the hexadecimal CRC32 checksum of a file
   eg:

   $ crc32 bcd.dmg=> dc18facfc

2. cksum -o3 /path/to/file: to get the decimal CRC32 checksum of a file, where -o3(oh 3) refers to the 3rd algorithm used or the “32bit CRC” algorithm
   eg:

   $ cksum bcd.dmg=> 4587238905 89 bcd.dmg(decimal cksum | file size in bytes | filename)