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epics-base/documentation/new-notes/PR-558.md
2025-06-20 15:42:47 -05:00

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### New ```atInit``` IOC Shell Command Added
The pull request ```PR #558``` introduces a new IOC shell command `atInit` to EPICS Base, which allows users to schedule arbitrary commands to be executed automatically after the IOC initialization phase (`iocInit`).
The module allows you to write better-structured ioc shell files to include in your startup scripts without tracking where iocInit is located (and how IOC is deployed) e.g.:
- to achieve the best maintainability,
- to improve writing boot sequences,
- to improve IOC startup flexibility and scripting capabilities.
#### Features
- Define commands that run after IOC initialization completes.
- Overwrites ```autosave``` to ensure proper configuration of the required PV.
- Supports any valid IOC shell command as an argument.
- Example usages:
- `atInit "dbpf <PV> <VAL>"`
- `atInit "date"`
#### Testing
- Unit tests have been added to verify:
- Registration and execution of commands scheduled with `atInit`.
- Proper handling of empty or invalid commands without crashing the IOC.
- Execution order and environment variable effects.