Have udev call: 
#!/bin/bash
sudo su - some_other_uname
# validate with whoami or id if desired

# run your command in the background
/usr/bin/yourcommand > /dev/null 2>&1 &

# script exits... but your command lives on.... running as the desired
+ user.
# forever zorked

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In reply to Re: Running process as another user by mhearse
in thread Running process as another user by morgon

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