rabbah commented on a change in pull request #2848: Support reading param.json
from stdin #2837
URL:
https://github.com/apache/incubator-openwhisk/pull/2848#discussion_r145533298
##########
File path: docs/actions.md
##########
@@ -202,6 +202,39 @@ Parameters can be passed to the action when it is invoked.
"payload": "Hello, Bernie from Vermont"
}
```
+4. It is possible to pipe JSON parameters to the `wsk` command by using the
special filename `-` with `--params-file` or `-P`:
+
+ ```
+ cat parameters.json | envsubst | wsk action invoke -r hello -P -
+ ```
+
+ This example uses `envsubst` to replace environment variables in the JSON
before passing them to the action invocation.
Review comment:
for the sake of the example is `envsubst` necessary? I can see the counter
argument it's already in a file why use `-`. How about using echo instead?
```bash
echo '{"name": "Alice"}' | wsk action invoke hello -r -P -
```
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