Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!bu-cs!madd
From: madd@bu-cs.BU.EDU (Jim Frost)
Newsgroups: comp.unix.questions
Subject: Re: how can .cshrc know if session is a login?
Message-ID: <31552@bu-cs.BU.EDU>
Date: 21 May 89 21:45:15 GMT
References: <434ccc08.bea3@mach1.engin.umich.edu> <14551@duke.cs.duke.edu>
Reply-To: madd@bu-it.bu.edu (Jim Frost)
Followup-To: comp.unix.questions
Distribution: na
Organization: Software Tool & Die
Lines: 35

In article <14551@duke.cs.duke.edu> khera@cs.duke.edu (Vick Khera) writes:
|In article <434ccc08.bea3@mach1.engin.umich.edu> brian@caen.engin.umich.edu (Brian Holtz) writes:
|>Howw can .cshrc know if a session is a login session?
|
|A simple way I do this is to test for the existence of an environment
|variable that gets set in .login such as NAME.

My solution is:

  if ($?SUBSHELL) then
    # do things that a non-login shell should do
  else
    # do things a login shell should do
    setenv SUBSHELL "yes"
  endif

This is particularly useful if you use SysV and don't have job
control, but regularly use something like Emacs which exits as if job
control existed:

  if ($?SUBSHELL) then
    alias % exit
    alias fg exit
  else
    alias % echo No current job.
    alias fg echo No current job.
    setenv SUBSHELL "yes"
  endif
  alias bg echo "Open the pod bay doors HAL.  I can't do that, Dave"

Just aliasing "%" and "fg" to "exit" has the annoying habit of logging
you out.

jim frost
madd@bu-it.bu.edu