CLIST data set attributes

If a CLIST data set is created by one of the previously described methods, and the CLIST keyword is specified on the EDIT command, the data set will be assigned the following default attributes (provided that your installation has not changed the default values):

A variable-length record format
If you specify a LINE value on the EDIT command, the data set will be of a fixed-length record format in the specified length.
A logical record size of 255 characters
A block size of 3120 bytes
Line numbers are contained in the last eight bytes of all fixed-length records and in the first eight bytes of all variable-length records
All input data and modified data are converted to uppercase characters.

Your installation may have changed these default attributes and may have established CLIST data set conventions to ease data set tasks.

If you concatenate CLIST data sets, specify the same RECFM and LRECL values for these data sets.

For a complete description of edited data sets see, the EDIT command in z/OS TSO/E Command Reference. For a discussion of the formats and characteristics of the RECFM subparameter of the DCB parameter, see z/OS MVS JCL Reference. If you want to obtain information about a data set for use in CLIST variables, see LISTDSI statement.