in reply to The problem of "the" default shell

Thank you very much, afoken, I learned quite a bit from your post.

I usually tend to avoid external commands as much as I can, but when I have had to, I sort of knew that it was deemed to be better to use a list of arguments rather than a single string, but I did not really know why, and I was never clear about the best way to call an external command. Now I understand better the impact of the various solutions. Thanks.