"Yes, you can port existing applications with a minimum of modification". Only the following modifications are normally REQUIRED:

• references to DISK file names.
• statements in your program that execute operating system commands -- The exceptions are EXECIO and GLOBALV; uni-REXX has implemented these popular mainframe commands and made them accessible from within a uni-REXX program.
• portions of your program that stack data for use by another, non-Rexx program after the Rexx program has completed EXECUTION -- Programs in UNIX run in individual PROCESSES, and there is no concept of a persistent.
• stack available to all processes. The modifications required here are usually simple, and TWG Technical Support is available to provide guidance, suggestions, and sample solutions.

If your Rexx program is primarily a series of operating system commands, then it may not be a good candidate for direct portation. It may be, however, that the functions it performs have reasonable counterparts in the UNIX environment and the program can be converted to execute the equivalent UNIX functions. 

"Yes, you can port existing applications with a minimum of modification". Only the following modifications are normally required:

If your Rexx program is primarily a series of operating system commands, then it may not be a good candidate for direct portation. It may be, however, that the functions it performs have reasonable counterparts in the UNIX environment and the program can be converted to execute the equivalent UNIX functions.