How can I pass my Windows credentials in cURL?

I use (in a Windows domain environment):

curl --ntlm -u : ...

cUrl knows to supply my domain credentials and it works every time.

Use -u : which provides an empty usercode and password, to get cURL to pick those up from the credential store.

I use this on Unix with GSSAPI and curl -u : --negotiate ...

To elaborate on @Phil P answer heres how I did it from my ubuntu box.

1. Find out the IP address of your domain controller instructions on how to do that here
2. Install kerberos sudo apt-get install krb5-user

3. Enter the following in your /etc/krb5.conf

   [libdefaults]
       default_realm = YOURDOMAN
       # note that this must be in UPPER CASE
       krb4_config = /etc/krb.conf
       krb4_realms = /etc/krb.realms
       kdc_timesync = 1
       ccache_type = 4
       forwardable = true
       proxiable = true
       v4_instance_resolve = false
       v4_name_convert = {
           host = {
               rcmd = host
               ftp = ftp
           }
           plain = {
               something = something-else
           }
       }
       fcc-mit-ticketflags = true
   [realms]
       YOURDOMAN = {
           kdc = YOUR_DOAMIN_CONTROLLER_IP
       }
   [domain_realm]
       yourdomain = yourdomain
       yourdomain. = yourdomain