How to keep rails command from Rails Console running after SSH Client (PuTTy) closes

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Use sudo apt-get install screen to install screen. Then run it using screen. Now you have a separate console window which can be detached using Ctrl + A, then D. Closing putty will not end your screen-session. If you log back in at any later point, you may resume the sessions using  screen -r.

To summarize:

> sudo apt-get install screen
> screen
# pops up a new shell
> rails c
# run your reindex operation
# press Ctrl + A, then D
> exit
# putty closes

# reconnect using putty
> screen -r
# you should be back in your rails console