Question
What if i need to have the same application running on multiple platforms, such as unix and the mainframe? does that mean i have to maintain two separate sources?
Answers
Not at all. Rexx includes an instruction that allows you to determine the environment in which your program is running. PARSE SOURCE will give you a string in which the first token is the name of the system where the program is running. For uni-REXX, this is "UNIX"; on the mainframe, it would be "CMS" or "TSO". Then you can put conditional processing into your program based on the current execution environment. In a program that needed to display a current listing of files, you might set your master source up something like this:
parse source env:

select
when env = 'UNIX' then command = 'ls'
when env = 'CMS' then command = 'listf'
when env = 'TSO' then command = 'listc'
otherwise call OS_error_routine
end
:
: [ to do a list command, you write]>
:
command /* value is sent to OS */   Your Comment




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