linux - How to find out the user of parent shell inside a child shell? -

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suppose user of parent shell foo. if run sudo -u bar -i, in child shell user bar. so, how can find out user of parent shell inside child shell? namely, in case above, how can know user of parent shell foo?

update
understand that, hack, possible achieve using ps. however, more interested in less hacky , more standard way, if possible.

update 2
answers, resorted following solution:

# parent shell, user foo $ sudo -u bar -i parent=foo  # child shell, show parent user foo $ ps u -p $ppid | grep parent | cut -d= -f2

you can use $ppid variable assist along command or two:

#!/bin/bash user=`ps u -p $ppid | awk '{print $1}'|tail -1` echo $user

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