cli.md

$ credential --help

  Usage: cmd [options] [command]


  Commands:

    hash [options] [password]  Hash password
    verify [hash] <password>   Verify password

  Options:

    -h, --help  output usage information

$ credential hash --help

  Usage: hash [options] [password]

  Hash password

  Options:

    -h, --help                    output usage information
    -w --work <work>              relative work load (0.5 for half the work)
    -k --key-length <key-length>  length of salt

The password argument for hash and the hash argument for verify both support piping by replacing with a dash (-):

$ echo -n "my password" | credential hash - | credential verify - "my password"
Verified

Exit codes 0 and 1 are used to communicate verified or invalid as well.