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| -rw-r--r-- | Documentation/user/driver-model.rst | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/Documentation/user/driver-model.rst b/Documentation/user/driver-model.rst index a0fd3e99b5..c543d6d9c4 100644 --- a/Documentation/user/driver-model.rst +++ b/Documentation/user/driver-model.rst @@ -88,7 +88,14 @@ The parameters can be used as shell variables: .. code-block:: sh eth0.ipaddr=192.168.23.15 - echo "my current ip is: $eth0.ipaddr" + echo "my current ip is: ${eth0.ipaddr}" + +.. note:: + + Hush shell syntax for defining and setting variables is the same, so + some characters such as hyphens are not allowed on the left hand side + of a shell variable assignment. :ref:`command_setenv`, if enabled, + can still be used to write such a variable though. device variables may have a type, so assigning wrong values may fail: |