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Re: Command line arguments [message #42619 is a reply to message #42530]

Thu, 17 February 2005 08:23

Mr. No Address
Messages: 11
Registered: February 2005

Junior Member

David Fanning wrote:
> Mr. No Address writes:
>
>
>> If I understand your first question above correctly, I'm compiling
>> first because "Way back in the day" I was never able to successfully run
>> code without compiling it first. I'm sure I was doing something wrong,
>
>
> No doubt. :-)
>
> This article might be useful to you:
>
> http://www.dfanning.com/tips/namefiles.html

It was. Thanks. In fact, self compiling worked so easily that I was
left wondering what I was doing wrong way back when. With some local
help I also have solved the Perl/IDL passing args issue that I'll
describe below for the next person.

Key words for google searches:
passing command line arguments args Perl IDL script code execute
executing system command commands

There were two problems I had. One was simply passing an argument from
within a Perl script to my IDL code. The second was getting Perl to
wait for the IDL process to finish before executing subsequent lines of
code.

Perl Code:
open(IDL, "|/usr/local/bin/idl") || die "Can't open IDL: $!";
print IDL "idlprog, \'$arg_to_pass\' \n";
print IDL "\$mv idl.ps renamed_file.ps\n";
close IDL;

The middle two print lines can be within a loop so you don't have to
open an IDL process for every iteration. I had to have the IDL process
rename the postscript file instead of doing:
`mv idl.ps renamed_file.ps`
or else Perl would zip by the first print statement and then fail to
find the idl.ps file. See
<http://archive.stsci.edu/iue/manual/dacguide/node8.html> for executing
system commands from IDL.

IDL Code:
PRO idlprog, passed_arg

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[Message index]

		Re: Command line arguments By: David Fanning on Fri, 11 February 2005 18:42
		Re: Command line arguments By: Craig Markwardt on Fri, 11 February 2005 14:52
		Re: Command line arguments By: Mr. No Address on Fri, 11 February 2005 14:19
		Re: Command line arguments By: Mr. No Address on Fri, 11 February 2005 14:11
		Re: Command line arguments By: Mr. No Address on Fri, 11 February 2005 13:49
		Re: Command line arguments By: Michael Wallace on Fri, 11 February 2005 13:17
		Re: Command line arguments By: Craig Markwardt on Fri, 11 February 2005 12:46
		Re: Command line arguments By: Mr. No Address on Thu, 17 February 2005 08:23
		Re: Command line arguments By: JD Smith on Mon, 21 February 2005 09:56

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