How do I run a shell?

[Bill Cairns]

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I create a folder bin under my home directory.

I create a file called dir in bin. The contents of the file is simply one line "ls".

I add execute to the file properties.

I type dir in the terminal window.

In SuSe I get the listing from the ls.

In Ubuntu I get "command not found".

In Ubuntu, if I type ". dir", it works.

Help!

Bill