Merge pull request #2890 from mitmproxy/newdocs

All new documentation

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+---
+title: "Commands"
+menu:
+    concepts:
+        weight: 6
+---
+
+# Commands
+
+Commands are the mechanism that allows users to actively interact with addons.
+Perhaps the most prominent example of this is the mitmproxy console user
+interface - every interaction in this tool consists of commands bound to keys.
+Commands also form a flexible and very powerful way to interact with mitmproxy
+from the command prompt. In mitmproxy console you can enter the command prompt
+with the `:` key. The prompt has intelligent tab completion for command names
+and many of the built-in argument types - give it a try.
+
+The canonical reference for commands is the `--commands` flag, which is exposed
+by each of the mitmproxy tools. Passing this flag will dump an annotated list of
+all registered commands, their arguments and their return values to screen. In
+mimtproxy console you can also view a palette of all commands in the command
+browser (by default accessible with the `C` key binding).
+
+
+# Working with flows
+
+Many of mitmproxy's commands take flows as arguments. For instance, the
+signature for the client replay commands looks like this:
+
+{{< highlight none  >}}
+replay.client [flow]
+{{< /highlight >}}
+
+
+That means that it expects a sequence of one or more flows. This is where [flow
+specifications]({{< relref concepts-filters >}}) come in - mitmproxy will
+intelligently expand a flexible flow selection language to a list of flows when
+invoking commands.
+
+Fire up mitmproxy console, and intercept some traffic so we have flows to work
+with. Now type the following command:
+
+{{< highlight none  >}}
+:replay.client @focus
+{{< /highlight >}}
+
+Make sure you try using tab completion for the command name and the flow
+specification. The `@focus` specifiers expands to the currently focused flow, so
+you should see this flow replay. However, replay can take any number of flows.
+Try the following command:
+
+{{< highlight none  >}}
+:replay.client @all
+{{< /highlight >}}
+
+Now you should see all flows replay one by one. We have the full power of the
+mitmproxy filter language at our disposal here, so we could also, for example,
+just replay flows for a specific domain:
+
+{{< highlight none  >}}
+:replay.client "~d google.com"
+{{< /highlight >}}
+
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