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What is the difference between "sudo -i" and "sudo bash -l"

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http://serverfault.com – There is a recent question regarding multiple sysadmins working as root, and sudo bash -l was referenced. I searched for this on google and SE, but I don't understand the difference between sudo bash -l and sudo -i. From the man pages for bash and sudo it seems that the difference may be that sudo bash -l runs ~/.bash_profile, ~/.bash_login, and ~/.profile, and ~/.bash_logout of the root user, but from testing myself it looks like it runs the normal user's .bashrc and not the root one. I may have misunderstood which user the ~ expression is referencing in the man pages. Clarification of the (HowTos)