Login shell?

[Griff Smith]

In article <25721 at bu-cs.BU.EDU>, madd at bu-cs.BU.EDU (Jim Frost) writes:
> In article <314 at uplog.se> thomas at uplog.UUCP (Thomas Hameenaho) writes:
| |One way of deciding wether or not the current shell is the login shell
| |is the fact that the name of the login shell is prependended with a '-'.
| ...
> That's not really a good indicator.   Instead what I'd do is build the
> process tree (you can use the output from ps or, better, sps if you
> can't build it from the actual process table).  Find the first entry in
> the tree for the terminal you want.  This will work on any unix
> system, while the naming convention may not.
| ...
> jim frost
> madd at bu-it.bu.edu

Still not quite right.  I usually use an AT&T 630 terminal on a 4.3BSD
system.  The login shell for the terminal is not the same as the shell
for the current window, and each window has a separate pty connected to
it.  The kludge I use also involves reading the output of ps (ugh): I
scan back through the process tree until I find a parent with a
different uid.  The child of that process is almost always the login
shell.  For my purposes, this also does the right thing for `su'.
I'd rather have someone support the concept of a session id so we could
avoid this sillyness.
-- 
Griff Smith	AT&T (Bell Laboratories), Murray Hill
Phone:		1-201-582-7736
UUCP:		{most AT&T sites}!ulysses!ggs
Internet:	ggs at ulysses.att.com