Holger Parplies wrote at about 23:03:57 +0200 on Tuesday, May 3, 2011:
 > Hi,
 > 
 > Les Mikesell wrote on 2011-05-03 15:14:08 -0500 [Re: [BackupPC-users] Not 
 > able to use the backuppc account in freebsd]:
 > > I'm surprised that sudo doesn't honor the user's shell.
 > 
 > really? It's really not surprising. The semantics of sudo is "allow executing
 > /exact/path/to/some/command as user X to user Y, possibly without password",
 > not "allow executing <something> that /some/random/shell would do when you
 > type $some_random_string at its prompt", so sudo would use an execve() system
 > call, not a user's login shell.
 > 
 > > su can override it with a command line option, but the issue that prompted
 > > this thread is that the linux/bsd flavors of su take different options.
 > 
 > As would be explained in the corresponding fine (tm) manual pages. I'm sure
 > the manual pages of 'sudo' would likewise explain whether there are
 > differences in its options on Linux vs. BSD (which, I'm guessing, there
 > probably aren't, but that's just a guess). So, the generic answer to the
 > original question is: RTFM, or, if that's too complicated, "use a command
 > with identical syntax".
 > 
 > Regards,
 > Holger
 > 
 > P.S.: I fully agree in advance with any responses.
 > 

FYI - You can get the behavior of using the /etc/passwd shell by using the
-i or -s flags -- see the manpage.

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