How do you find the original user through multiple sudo and su commands?

Question

When running a script via sudo or su I want to get the original user. This should happen regardless of multiple sudo or su runs inside of each other and specifically sudo su -. Answer Results: Use who am i | awk '{print $1}' OR logname as no other methods are guaranteed. Logged in as self: Normal sudo: sudo su

Accepted Answer

Results:Use who am i | awk '{print $1}' OR logname as no other methods are guaranteed.Logged in as self:evan> echo $USERevanevan> echo $SUDO_USERevan> echo $LOGNAMEevanevan> whoamievanevan> who am i | awk '{print $1}'evanevan> lognameevanevan>Normal sudo:evan> sudo -sroot> echo $USERrootroot> echo $SUDO_USERevanroot> echo $LOGNAMErootroot> whoamirootroot> who am i | awk '{print $1}'evanroot> lognameevanroot>sudo su &#8211; :evan> sudo su -[root ]# echo $USERroot[root ]# echo $SUDO_USER[root ]# echo $LOGNAMEroot[root ]# whoamiroot[root ]# who am i | awk '{print $1}'evan[root ]# lognameevan[root ]#sudo su -; su tom :evan> sudo su -[root ]# su tomtom$ echo $USERtomtom$ echo $SUDO_USERtom$ echo $LOGNAMEtomtom$ whoamitomtom$ who am i | awk '{print $1}'evantom$ lognameevantom$

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