Use the CREATE command to add a new member to a partitioned data set, create a new sequential data set, or create a new z/OS® UNIX file. Use the REPLACE command to rewrite a member, sequential data set, or z/OS UNIX file. The process of creating and replacing data is very similar. However, remember that when you replace data, the original data is deleted and replaced with the new data.

There are two ways you can use CREATE or REPLACE:

1. You can type either CREATE or REPLACE on the command line, followed by the name of a member, the name of a data set and member, the name of a sequential data set, or the name of a z/OS UNIX file to be created or replaced. You can add line labels that show the lines to be copied. If you omit the labels, you can use the C (copy) or M (move) line commands to specify which lines are to be copied or moved. Then press Enter. See CREATE—Create Data and REPLACE—Replace Data for the complete syntax of the commands.
2. If you omit the member name, data set name and member, sequential data set name, or z/OS UNIX file name, and just type CREATE or REPLACE and specify the lines to be used to create or replace the member, the editor displays a panel requesting the name of the member or data set you want created or replaced.

If you try to create or replace data that has inconsistent attributes (for example, replacing a sequential data set with a member of a partitioned data set), the editor displays a warning and gives you an opportunity to cancel the command:

                           EDIT - Confirm Replace

 Data set attributes are inconsistent. Truncation may result in
 the right-most portions of some records if replace is performed.

  "Target" data set attributes:
      Data set name. : USERID.PRIVATE.STUFF
      Record format. : VARIABLE
      Record length. : 133

  "Current" data set attributes:
      Data set name. : USERID.PRIVATE.EXEC(PGM1)
      Record format. : VARIABLE
      Record length. : 251

 Press ENTER key to allow replace with truncation.
 Enter END command to cancel replace.