Equivalent of Rexx Interpret? Post: 87006

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Operating Systems AIX Equivalent of Rexx Interpret? Post 87006 by bakunin on Wednesday 19th of October 2005 07:51:19 AM

10-19-2005

Registered User

The "eval" is not necessary at all:

variable="print - 'hello world'"
$variable

will print "hello world".

ksh has a fixed order of the operations it undertakes before finally executing the result on the commandline. "eval" restarts this process and evaluates the already processed commandline a second time. It works (somehow) analogous to derefencing a pointer in C:

# var1="Willy"
# var2="Tony"
# selector='$var1'
# print - $selector
$var1
# eval print - $selector
Willy
# selector='$var2'
# print - $selector
$var1
# eval print - $selector
Tony

The reason is: The shell gets the command line "print - $selector" and evaluates that (by expanding the variable with its content) to "print - $var1". The process would normally stop there, but in case of using "eval" it would now again try to evaluate its own result and in this case (since "$var1" will expand to the content of var1) end up with "print - Willy".

I hope this clarifies things.

Btw. I remember there was a REXX interpreter for AIX 3.2.5 (yep, that's been awhile), maybe it is possible to still get it from IBM. I doubt that it will be available for other Unixes, though.

bakunin

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