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curl/docs/cmdline-opts/proxy-user.d

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+Long: proxy-user
+Short: U
+Arg: <user:password>
+Help: Proxy user and password
+Category: proxy auth
+---
+Specify the user name and password to use for proxy authentication.
+
+If you use a Windows SSPI-enabled curl binary and do either Negotiate or NTLM
+authentication then you can tell curl to select the user name and password
+from your environment by specifying a single colon with this option: "-U :".
+
+On systems where it works, curl will hide the given option argument from
+process listings. This is not enough to protect credentials from possibly
+getting seen by other users on the same system as they will still be visible
+for a brief moment before cleared. Such sensitive data should be retrieved
+from a file instead or similar and never used in clear text in a command line.
+
+If this option is used several times, the last one will be used.