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

bakunin

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LEARN ABOUT MOJAVE

net::dns::rr::tlsa5.18

Net::DNS::RR::TLSA(3)					User Contributed Perl Documentation				     Net::DNS::RR::TLSA(3)

NAME

       Net::DNS::RR::TLSA - DNS TLSA resource record

SYNOPSIS

	   use Net::DNS;
	   $rr = new Net::DNS::RR('name TLSA usage selector matchingtype certificate');

DESCRIPTION

       The Transport Layer Security Authentication (TLSA) DNS resource record is used to associate a TLS server certificate or public key with the
       domain name where the record is found, forming a "TLSA certificate association".  The semantics of how the TLSA RR is interpreted are
       described in RFC6698.

METHODS

       The available methods are those inherited from the base class augmented by the type-specific methods defined in this package.

       Use of undocumented package features or direct access to internal data structures is discouraged and could result in program termination or
       other unpredictable behaviour.

   usage
	   $usage = $rr->usage;
	   $rr->usage( $usage );

       8-bit integer value which specifies the provided association that will be used to match the certificate presented in the TLS handshake.

   selector
	   $selector = $rr->selector;
	   $rr->selector( $selector );

       8-bit integer value which specifies which part of the TLS certificate presented by the server will be matched against the association data.

   matchingtype
	   $matchingtype = $rr->matchingtype;
	   $rr->matchingtype( $matchingtype );

       8-bit integer value which specifies how the certificate association is presented.

   cert
	   $cert = $rr->cert;
	   $rr->cert( $cert );

       Hexadecimal representation of the certificate data.

   certbin
	   $certbin = $rr->certbin;
	   $rr->certbin( $certbin );

       Binary representation of the certificate data.

COPYRIGHT

       Copyright (c)2012 Willem Toorop, NLnet Labs.

       All rights reserved.

       This program is free software; you may redistribute it and/or modify it under the same terms as Perl itself.

       Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.

SEE ALSO

       perl, Net::DNS, Net::DNS::RR, RFC6698

perl v5.18.2							    2014-01-16						     Net::DNS::RR::TLSA(3)