README.md: Add examples of `deqp-run --cmd`HEADmaster

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diff --git a/README.md b/README.md
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@@ -47,6 +47,19 @@ $ deqp-run dEQP-VK.graphicsfuzz.spv-stable-pillars-volatile-nontemporal-store
 $ deqp-run vk
 ```
 
+#### Full command
+
+```console
+$ deqp-run --cmd vk
+deqp-runner run --caselist [...]
+```
+
+Particularly useful for running a single test under `gdb`:
+
+```console
+$ mesa-gdb $(deqp-run --cmd dEQP-VK.graphicsfuzz.spv-stable-pillars-volatile-nontemporal-store)
+```
+
 ### Make Markdown table of dEQP test results
 
 ```console