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curl

    1: Long: user
    2: Short: u
    3: Arg: <user:password>
    4: Help: Server user and password
    5: ---
    6: Specify the user name and password to use for server authentication. Overrides
    7: --netrc and --netrc-optional.
    8: 
    9: If you simply specify the user name, curl will prompt for a password.
   10: 
   11: The user name and passwords are split up on the first colon, which makes it
   12: impossible to use a colon in the user name with this option. The password can,
   13: still.
   14: 
   15: On systems where it works, curl will hide the given option argument from
   16: process listings. This is not enough to protect credentials from possibly
   17: getting seen by other users on the same system as they will still be visible
   18: for a brief moment before cleared. Such sensitive data should be retrieved
   19: from a file instead or similar and never used in clear text in a command line.
   20: 
   21: When using Kerberos V5 with a Windows based server you should include the
   22: Windows domain name in the user name, in order for the server to successfully
   23: obtain a Kerberos Ticket. If you don't then the initial authentication
   24: handshake may fail.
   25: 
   26: When using NTLM, the user name can be specified simply as the user name,
   27: without the domain, if there is a single domain and forest in your setup
   28: for example.
   29: 
   30: To specify the domain name use either Down-Level Logon Name or UPN (User
   31: Principal Name) formats. For example, EXAMPLE\\user and user@example.com
   32: respectively.
   33: 
   34: If you use a Windows SSPI-enabled curl binary and perform Kerberos V5,
   35: Negotiate, NTLM or Digest authentication then you can tell curl to select
   36: the user name and password from your environment by specifying a single colon
   37: with this option: "-u :".
   38: 
   39: If this option is used several times, the last one will be used.