This is an OS X Terminal command for the "Adler-32"
checksum of a file or files.  It works (data forks only)
starting with Tiger OS X 10.4 (UB) and tested up to El Capitan
OS X 10.11 , may work with even higher macOS (?).

Syntax is identical to Terminal's crc32 command.

Copy "adler" to one of your "bin" folders,
like "/usr/bin" or "/bin" or "/usr/sbin" or "/sbin".
