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Update for supporting multiple logging level settings #290

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Jul 6, 2020
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Update for supporting multiple logging level settings #290

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Update for supporting multiple logging level settings
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14 changes: 11 additions & 3 deletions articles/150_ros_command_line_arguments.md
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Expand Up @@ -167,16 +167,24 @@ another_node:
string_param: bar
```

#### Logging level
#### Multiple Logging level assignments
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Minimum logging level can be externally set using the `--log-level` option.
Logging level assignments have two means of settings which are a global logging level and other logging levels for specific loggers. Minimum logging level can be externally set using the `--log-level` option.
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As an example, to set logging level to `DEBUG` for `some_ros_executable`, one may execute:
As an example, to set a global logging level to `DEBUG` for `some_ros_executable`, one may execute:

```sh
ros2 run some_package some_ros_executable --ros-args --log-level DEBUG
```

Some specific loggers can be set using the `--log-level` option as well, the format as follows:
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```sh
ros2 run some_package some_ros_executable --ros-args --log-level talker1:=DEBUG --log-level talker2:=WARN
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It might be nice to have an example that's not just a node, like maybe rclcpp or talker1.rclcpp or something more interesting like that.

```

Note that the logging level of a specific logger can override the global logging level for this logger.
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See `rcutils` and `rcl` logging documentation for reference on existing logging levels.

#### External logging configuration
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