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From: Greg Wooledge <wooledg@eeg.ccf.org>
Newsgroups: gnu.bash.bug
Subject: Re: "su -m" (on Mac) preserves $HOME and $USER but not ~
Date: Thu, 29 Oct 2015 16:00:06 -0400
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On Thu, Oct 29, 2015 at 01:02:10PM -0400, dabe@dabe.com wrote:
> 	Check out this copy-paste:
> 
> 		Thu Oct 29 12:32:22 dabe@triton:~> su -m root -c "bash"
> 		Password:
> 		Thu Oct 29 12:32:26 root@triton:~# echo $HOME ... ~
> 		/Users/dabe ... /Users/dabe
> 		Thu Oct 29 12:32:27 root@triton:~# echo $HOME ... ~
> 		/Users/dabe ... /Users/dabe
> 		Thu Oct 29 12:32:28 root@triton:~# echo $HOME ... ~
> 		/Users/dabe ... /Users/dabe
> 		Thu Oct 29 12:32:28 root@triton:~# echo $HOME ... ~
> 		/Users/dabe ... /var/root
> 		Thu Oct 29 12:32:28 root@triton:~# echo $HOME ... ~
> 		/Users/dabe ... /var/root
> 
> 	Notice how my $HOME stays the same (good) but my ~ changes
> 	to /var/root -- and it changes AFTER I've been logged in for
> 	a little while!  <scratching head>

Do you have a PROMPT_COMMAND variable?  Or something unusual in your
PS1 variable?  (Doesn't look it from the copy/paste, but you never
know.)  Or do you have a DEBUG trap?