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November 11, 2016

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Feature Article - TechTip

TechTip: IFS Containers Part 2, Automation with IBM i Chroot

Automation wins in the end. IFS Containers have automation as a first class citizen.

Written by Aaron Bartell

In the first article of this series, I discussed what IFS Containers are and how they use the chroot command to implement the container concept. To create the IFS Container, we had to manually create directories and copy files. That wasn't a big deal for the small example we created, but imagine if you needed to create an IFS Container for an entire PASE application that had requirements for hundreds of directories, commands, and libraries. This is where automation becomes a necessity, and more specifically, the IBM i Chroot open-source project.

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MC Press Bookstore

This ain’t your mama’s RPG! Time to move on from OPM—with Evolve Your RPG Coding. This comprehensive new book gives you all the tools to move to a more modern, modular, and efficient ILE RPG. The book guides you through the transition at a comfortable pace, making every ILE concept totally accessible. You’ll start with simple, easy-to-understand examples and analogies to OPM, then advance to complete and complex ILE code. Finally, you’ll go beyond ILE with a detailed discussion of SQL, code organization, and structure. Order your copy today!

MC Press Bookstore

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Feature Article - TechTip

RPG Fundamentals Tip #3: Working with Nomain Modules

Unlike cycle main and linear main programs, nomain modules have no main procedure.

Written by Bryan Meyers and Jim Buck

Editor’s note: This article is excerpted from Programming in ILE RPG, Fifth Edition, chapter 14, “Building Modular Programs with Procedures.”

The programs previously discussed [cycle main and linear main] are complete programs in themselves. They include a main procedure, along with all the other required subprocedures, coded within one source member, or compile unit. ILE also enhances modular programming concepts by allowing you to code a source member that consists of a segment of a program without a main procedure. The resulting Nomain module contains only subprocedures (one or more) that you can combine with other modules to create a program. By itself, a Nomain module cannot create a program object. One of the modules in a program must have a main procedure.

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