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Re: Length of command line input [message #49552 is a reply to message #49551]

Thu, 03 August 2006 10:47

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

TimLS wrote:
> I couldn't find the answer to this in the online documentation but
> perhaps someone has seen this before, or can suggest a good work
> around.
>
> I have a procedure which takes lots and lots of keywords, many of which
> are really long filenames, e.g.
> test_program,input1='really_long_filename1',input2='really_l ong_filename2',....
>
> Eventually IDLDE running under linux decides that it has had enough and
> essentially only accepts the first 500 characters (approximately) that
> have been typed into the command line. (Trying to run it as a batch
> file has the same effect).
>
> Is there a limit on the length of the command line, and is it possible
> to extend it anyhow?

Hello,

Dunno about answers to your actual questions (sorry), but in batch mode, can't you recast
things as:

input1='really_long_filename1'
input2='really_long_filename2'
...etc...
test_program,input1=input1,input2=input2,...etc...

Another approach (assuming your other arguments are also similar, i.e. filenames) would be
to do:

input_files=strarr(nfiles) ; however many files you want to process this time
input_files[0]='really_long_filename1'
input_files[1]='really_long_filename2'
...etc...
test_program,input_files=input_files

and then, in your program, test for the size of the input_files keyword after you've
verified it's existence.

?

I am impressed that you've testing the too-long-command-line issue on the command line
itself (500 chars! Cripes.) -- but I think addressing the problem you're having by
modifying your code is a path of much lower resistance.

And, another thing to consider; if you do figure out how to increase the available length
of the command line, is there any guarantee that it will work on a different platform? Or
even a different version of IDL/IDLDE?

paulv

--
Paul van Delst Ride lots.
CIMSS @ NOAA/NCEP/EMC Eddy Merckx
Ph: (301)763-8000 x7748
Fax:(301)763-8545

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[Message index]

		Re: Length of command line input By: Paul Van Delst[1] on Thu, 03 August 2006 13:22
		Re: Length of command line input By: news.qwest.net on Thu, 03 August 2006 12:43
		Re: Length of command line input By: news.qwest.net on Thu, 03 August 2006 12:39
		Re: Length of command line input By: JD Smith on Thu, 03 August 2006 12:13
		Re: Length of command line input By: larkn10 on Thu, 03 August 2006 10:51
		Re: Length of command line input By: Paul Van Delst[1] on Thu, 03 August 2006 10:47
		Re: Length of command line input By: TimLS on Fri, 04 August 2006 01:01

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