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I've just installed IRAF on a Redhat/Fedora box. Most of the IRAF tasks that I've tried so far work normally. The one exception is the combine tasks in CCDRED. When I try to run input images (lists or wildcards) with combine tasks I get the following error; "ERROR on line 46: no images to combine". The images are in the image directory and are accessed normally by other tasks. Thanks for the help.

If you search the forums you'll see this is a fairly common question. The problem is usually something like not setting the CCDPROC parameter to do something like flatfield calibration, or in the case of the combine tasks having missing/invalid IMAGETYP keywords to identify the images properly. See the CCDRED user's doc at https://iraf.net/irafdocs/ccduser3/ for more details but note the CCDLIST task can be used to figure out what type the system thinks each image is. As a really simple workaround you can for a task like dark/zerocombine to work on all the images it is given by setting the 'cctype' parameter to an empty string, e.g.[code:1:cb4ddb74e9]cl> zerocombine zero*.fits cctype=""[/code:1:cb4ddb74e9]Hope this helps.Cheers,
-Mike