Matlab equivalents needed (yes very original)

[Michael V]

How do people do the following in Octave:

1. ask user to select a directory (uigetdir in Matlab but I am open to a hack)?
2. Generate a globally unique ID (dicomuid in Matlab but I have no need for dicom cruft)?
3. In Octave for windows, how does one force "\n" to be a windows/dos newline rather than unix?

Thanks in advance.

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