The Update function performs the update online or in batch. It displays a pop-up panel where you can specify from 1 to 4 from and to character strings for the update function. The Update function provides the Preview Before Update parameter that displays the update results without actually making the changes to the Update data set, and the Input Format JCL parameter maintains JCL syntax integrity when updating partitioned data sets that contain JCL.
You can also specify the updates by field-name. In this case, after pressing Enter, the Update Fields panel is displays. You may type your from and to data directly from this panel. You must enter a data set and member to use the Update by Field Name function.
All updates are made directly to the Update data set unless Preview Before Update is set to Y. Record lengths are not modified nor is data shifted left or right if the from and to strings are unequal in length, unless the Input Format L option is set to Y. In this case, data may be shifted left or right and if necessary moved to a new (continued) JCL statement.
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