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third/libcurl/docs/cmdline-opts/_PROGRESS.md

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+<!-- Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. -->
+<!-- SPDX-License-Identifier: curl -->
+# PROGRESS METER
+
+curl normally displays a progress meter during operations, indicating the
+amount of transferred data, transfer speeds and estimated time left, etc. The
+progress meter displays the transfer rate in bytes per second. The used
+suffixes (`k` for kilo, `M` for mega, `G` for giga, `T` for tera, `P` for peta
+and `E` for exa) are 1024 based. For example 1k is 1024 bytes. 1M is 1048576
+bytes. Strictly speaking this makes the units kibibyte and mebibyte etc.
+
+curl displays this data to the terminal by default, so if you invoke curl to
+do an operation and it is about to write data to the terminal, it *disables*
+the progress meter as otherwise it would mess up the output mixing progress
+meter and response data.
+
+If you want a progress meter for HTTP POST or PUT requests, you need to
+redirect the response output to a file, using shell redirect (\>), --output or
+similar.
+
+This does not apply to FTP upload as that operation does not spit out any
+response data to the terminal.
+
+If you prefer a progress bar instead of the regular meter, --progress-bar is
+your friend. You can also disable the progress meter completely with the
+--silent option.