CA Disk commands that name a single specific data set to be processed are referred to as explicit commands. Those that cause VTOC and/or catalogs to be scanned are called implicit commands. By definition, the data set name entered on an explicit command cannot contain any pattern characters. The specific name entered (original and perhaps new name) is validated according to the requirements as specified in the IBM JCL reference manual—rules for coding the data set name field. Invalid characters will cause the command to be rejected. Implicit commands do not have the data set name/pattern entries validated in this manner, since they process names that already exist in the VTOC or catalog.
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