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# Serverless Apache OpenWhisk CLI Reference

Welcome to the Serverless Apache OpenWhisk CLI Reference!  Please select a section on the left to get started.

**Note:** Before continuing [Apache OpenWhisk system credentials](../guide/credentials.md) are required for using the CLI.

If you have questions, join the [chat in gitter](https://gitter.im/serverless/serverless) or [post over on the forums](http://forum.serverless.com/).