how can .cshrc know if session is a login?

[Jim Frost]

In article <14551 at duke.cs.duke.edu> khera at cs.duke.edu (Vick Khera) writes:
|In article <434ccc08.bea3 at mach1.engin.umich.edu> brian at 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 at bu-it.bu.edu