Add inner_args to usage summary

README.md

@@ -15,12 +15,14 @@ usage: duct [-h] [--version] [-p OUTPUT_PREFIX]
             [--report-interval REPORT_INTERVAL] [-c {all,none,stdout,stderr}]
             [-o {all,none,stdout,stderr}]
             [-t {all,system-summary,processes-samples}]
-            command ...
+            command [inner_args ...] ...
 
 Gathers metrics on a command and all its child processes.
 
 positional arguments:
-  command               The command to execute.
+  command [inner_args ...]
+                        The command to execute, along with its inner
+                        arguments.
   inner_args            Arguments for the command.
 
 options:

src/duct.py

@@ -212,7 +212,11 @@ def create_and_parse_args():
         description="Gathers metrics on a command and all its child processes.",
         formatter_class=argparse.ArgumentDefaultsHelpFormatter,
     )
-    parser.add_argument("command", help="The command to execute.")
+    parser.add_argument(
+        "command",
+        metavar="command [inner_args ...]",
+        help="The command to execute, along with its inner arguments.",
+    )
     parser.add_argument(
         "--version", action="version", version=f"%(prog)s {__version__}"
     )