Re: Linux environment variable question

[David Grundberg]

David Aldrich wrote:
> Hi
>
> I need to run a function under Octave that requiries two filenames as 
> parameters. The parameters must be full paths, but the paths are long, so I 
> want to specify part of the path by an environment variable. However, I can't 
> get the syntax right. Here is what I do:
>
> $ mypath = 'home/myname' 
>
> $ octave -q --eval "fprintf('%x', RegressionTest($mypath + 'filename1', $mypath + 
> 'filename2'))"
>
> but this gives a syntax error in the path.
>
> What would be correct syntax please?
>
> Best regards
>
> David
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>   

I think you could attack the problem from a different angle, to save 
yourself some quoting headaches. Write a script file interpretable.m 
containing:

#!/usr/bin/octave -qf
arg_list = argv ();
printf ("%x", RegressionTest (arg_list{1}, arg_list{2}));

and then execute

chmod u+x interpretable.m
./interpretable "$mypath/filename1" "$mypath/filename2"

Notice the shell quotes, they are significant.

This way you allow the shell do the part of the job it is supposed to do.

hth
David