how can you reset root's home directory?

[Albretch]

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the thing is that I am trying to avoid for knoppix to use actual RAM for temporary directories for browsers and such things
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What I would like to do is something like this:
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a) start knoppix using single or "init 2"(?)
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b) mount a partition
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c) inside of the mounted partition create a scratch directory
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d) edit /etc/shadow so that the home directory now points to c)
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e) go reboot
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this way I don't have to reset temporary folders in browsers etc. It will all go there
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lbrtchx

[OErjan]

why root? if you create a permanent home you get what you wanted without being root.