Re: Tutorial PSF subtraction

[Mohammad Akhlaghi]

Hi Alex,

Thanks a lot for sharing this issue.

Are there any files in your 'outer/stamps/*.fits'?

It looks like the problem originates from the 'imgs=outer/stamps/*.fits' 
line. Let me explain:

When there are files that match your wildcard pattern 
('outer/stamps/*.fits' in this case), the shell will expand the '*' and 
replace the full names of all matched files. However, when no files 
match, the shell will just return the raw string (which is what is 
happening here). You can test this with this simple test:

$ echo "abc" > junk.txt
$ imgs=ju*.txt
$ echo $imgs
junk.txt

$ imgs=JU*.txt
$ echo $imgs
JU*.txt

$ rm junk.txt

The output of the first 'echo $imgs' is the actual names of the files. 
But the second time we defined 'imgs', we used 'JU' instead of 'ju' 
(just as an example of a non-matching pattern). Therefore you see that 
the 'echo $imgs' after the second definition just shows your pattern, 
and not the file names.

If my guess is right, you are probably not running the command in the 
proper directory.

I look forward to the result of this test ;-),
Cheers,
Mohammad