Maintaining Access Rules with the ACF Command › Access Rule Components › Access Rule Entries › Different Types of Access Rules

Different Types of Access Rules

When writing access rules, keep the following points in mind:

• You can specify access rules in fixed or variable format. Fixed format records with a length of 80 have the last eight characters reserved for a sequence field.
• You can use a blank space and a dash (-) at the end of the line to continue all control statements and rule entries on multiple lines.
• The $KEY control statement is the only required control statement. You can specify any or all of the additional control statements, but only one of each type is allowed per rule set. All control statements that begin with a dollar sign ($) must precede all control statements that begin with a percent sign (%).
• Control statements begin in column one. You can specify multiple $ control statements on the same line with a single $ in column one. Rule set entries must begin in column two so an entry beginning with an asterisk is not treated as a comment line.

This section describes how to write access rules to control access to each of the following portions of your VM system:

• Minidisk links
• CMS files
• SFS files
• OS/390 data sets
• VSE data sets
• VSAM allocation protection
• DASD ATTACH commands
• Tape volumes
• DASD Dump Restore (DDR) service program
• VM Batch environment and subsystem.

We provide sample access rules for each of these items. We also explain how to use NEXTKEY to merge and split access rule sets.