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EXECIO and IRXJCL

The basic point to remember is that EXECIO does work under the control of IRXJCL.

However other TSO Services which are available when executing IKJEFT01 (TSO) in Batch, are not available to IRXJCL.

Using IRXJCL

In the context of file processing the restrictions when using IRXJCL are:

• the ALLOCATE (ALLOC) Command is not available
  JCL DD statements should be used instead.
  
  
• The ATTRIB command is not available
  As alternatives use the LIKE operand or SMS DATACLAS, either explicitly on the DD statement, or implicitly via instllation ACS Routines.
  
  
• the FREE command is not available
  relay on the DD statement DISP operand, as the data sets will be de-allocated automatically at step/job end.
  
  
• none of the other TSO Commands or Functions are available, this includes LISTDS or LISTDSI.
  
  
• none of the Access Method Services commands are available
  The alternative is to execute IDCAMS steps separately.