Apache Oozie - Part 12: Oozie Shell Action + Passing output from one Oozie action to another

I had read about the Oozie capability to allow passing output from one action to another and forgotten about it, sure enough, it came up at an interview.  Here's some sample code...

1.0. What's covered in the blog?

1. Documentation on the Oozie shell action
2. A sample oozie workflow that includes a shell script action that echoes a count of the number of lines in a file glob, and an email action that captures the output of the shell action and email it.

Version:
Oozie 3.3.0; Pig 0.10.0

Related blogs:
Blog 1: Oozie workflow - hdfs and email actions
Blog 2: Oozie workflow - hdfs, email and hive actions
Blog 3: Oozie workflow - sqoop action (Hive-mysql; sqoop export)
Blog 4: Oozie workflow - java map-reduce (new API) action
Blog 5: Oozie workflow - streaming map-reduce (python) action 
Blog 6: Oozie workflow - java main action
Blog 7: Oozie workflow - Pig action
Blog 8: Oozie sub-workflow
Blog 9a: Oozie coordinator job - time-triggered sub-workflow, fork-join control and decision control
Blog 9b: Oozie coordinator jobs - file triggered 
Blog 9c: Oozie coordinator jobs - dataset availability triggered
Blog 10: Oozie bundle jobs
Blog 11a: Oozie Java API for interfacing with oozie workflows
Blog 12: Oozie shell action + passing output from one action to another

2.0. Documentation on the Oozie Shell Action

Apache documentation is available at - http://oozie.apache.org/docs/3.3.0/DG_ShellActionExtension.html

3.0. Sample program

4.0. Oozie web console screenshots