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Well, not sure why you think your root when it tells you who you are at the bash prompt and when running the whoami command.. you'd think if you thought you were running as root, you'd see root mentioned somewhere..
Edit your /etc/bashrc and put this in place of the PS1 line which is there now.
# bash-specific settings
ROOT_UID=0
if [ "$UID" -eq "$ROOT_UID" ]
then
PS1="\[\033[31;1m\]\u \d] \\$\w\n \[\033[0m\]"
else
PS1="\[\033[34;1m\]\u \d] \\$\w\n \[\033[0m\]"
fi
This changes the shell prompt in the following ways:
If you are root, the name root shows, and the color is red (warning).
If you are user, the username shows, and the color is blue (cool).
The prompt also shows the day of the week, the month, the date, and the full path to wherever you are in the directory tree.
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