Re: "su -m" (on Mac) preserves $HOME and $USER but not ~

[Greg Wooledge]

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?