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deps/curl/docs/cmdline-opts/proxy-user.md

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+---
+c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+SPDX-License-Identifier: curl
+Long: proxy-user
+Short: U
+Arg: <user:password>
+Help: Proxy user and password
+Category: proxy auth
+Added: 4.0
+Multi: single
+See-also:
+  - proxy-pass
+Example:
+  - --proxy-user name:pwd -x proxy $URL
+---
+
+# `--proxy-user`
+
+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 hides 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 still are visible for a 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.