1 Long: proxy-user 2 Short: U 3 Arg: <user:password> 4 Help: Proxy user and password 5 --- 6 Specify the user name and password to use for proxy authentication. 7 8 If you use a Windows SSPI-enabled curl binary and do either Negotiate or NTLM 9 authentication then you can tell curl to select the user name and password 10 from your environment by specifying a single colon with this option: "-U :". 11 12 If this option is used several times, the last one will be used. 13