Separate root history files

When there are multiple administrators to a system, it's very difficult to determine which admin made changes when the root's history file is the same no matter which user su'd to root. With the code below put in a kshrc file, each admin that su's into root will have their own root's history file.
Tty=$(tty|cut -f3-4 -d/)
Per=`last |grep $Tty |head -1 | awk '{ print $1 }' |cut -c 1-5`

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This was first published in January 2003

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