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curl/docs/cmdline-opts/help.d

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+Long: help
+Arg: <category>
+Short: h
+Help: Get help for commands
+Category: important curl
+---
+Usage help. This lists all commands of the <category>.
+If no arg was provided, curl will display the most important
+command line arguments.
+If the argument "all" was provided, curl will display all options available.
+If the argument "category" was provided, curl will display all categories and
+their meanings.