> For the complete documentation index, see [llms.txt](https://open-mainframe-project.gitbook.io/mainframe-open-education-project/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://open-mainframe-project.gitbook.io/mainframe-open-education-project/chapter-2-mainframe-101-foundational-technology/job-control-language-and-system-display-and-search-facility/utilities.md).

# Utilities

Utilities are simple programs or pre-written programs which perform commonly needed functions

Utilities are widely used by system programmers and application developers to achieve day-to-day requirements, organizing and maintaining data.

There are two types of utility they are dataset utilities and system utilities 

**Dataset utilities:**

* Used to perform the task on the dataset
* Name start with IEB
* IEBCOPY, IEBEDIT, IEBCOMPR, IEBGENER are the few dataset utilities

**System utilities:** 

* Used to perform the task on system Maintenace
* Name starts with IEH
* IEHMOVE, IEHLIST, IEHPROGM are the few System utilities

**Common JCL DD names:**

* **SYSUT1**: Input file
* **SYSUT2:** Output file
* **SYSUT3:** Work file for input (SYSUT1)
* **SYSUT4:** Work file for output (SYSUT2)
* **SYSIN:** Used to pass parameters for the utility
* **SYSOUT:** Output file for message from utility
* **SYSPRINT:** Output file printed output from utility
* **SYSUDUMP:** It's an output file for a system dump if program fails


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