How to tar files with no extensions?

Question

I have some directories with a varying numbers of files and subdirectories. All files that have no extensions have to be tared. Their names may change, thus they can not be hardcoded. Subdirectories may also contain a unspecified number of files and subdirectories that are not relevant and should not be included in the archive.

I'd like to be able to do this with a single line, not using any .sh scripts, so that this process could be reproduced as portably as possible.

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Sample directory structure:

$ ls -1F

bar-dir/
bar.with.dots
foo-directory/
foo-no-ext
quux.dir/
quux.ext

The resulting tar should contain only foo-no-ext in this case.

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The closest I've come up with this far is

tar -cf archive.tar --exclude=*.* --no-recursion *

But, when executed on the sample set, the archive.tar still includes the subdirectories (even though empty):

$ tar -tf archive.tar

bar-dir/
foo-directory/
foo-no-ext

Answer 1

This command does what you want:

 find * -maxdepth 0 -type f | tar -cf archive.tar --exclude=*.* -T -

The find command finds all files * only in the current directory -maxdepth 0 that are files -type f (not directories, devices or other special files). The resulting files are passed to tar which excludes the names containing a dot.

Answer 2

How about:

tar -cf archive.tar `ls|grep "^[^.]*$"`

It doesn't expect much out of the shell, but assume that grep exists (I've never seen a system without it).