Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!bloom-beacon!bu-cs!purdue!decwrl!sun!pitstop!sundc!seismo!uunet!mcvax!prlb2!kulcs!kulesat!imec!croes
From: croes@imec.uucp (Kris Croes)
Newsgroups: comp.unix.questions
Subject: Re: Login shell?
Summary: Detection of "source .cshrc"
Message-ID: <511@imec.UUCP>
Date: 11 Oct 88 14:25:15 GMT
References: <3ed799bc.103e8@hi-csc.UUCP> <13851@mimsy.UUCP>
Reply-To: croes@imec.UUCP (Kris Croes)
Organization: IMEC, INTERUNIVERSITY MICROELECTRONICS CENTER, BELGIUM
Lines: 39

In article <3ed799bc.103e8@hi-csc.UUCP> mukul@hi-csc.UUCP (Mukul Agrawal)
writes:
>Is there a way ( /bin/csh , Sun Unix 3.4 ) to find out if the shell
>that is running is a login shell or not, just like one can use
>"$?prompt" to find out whether or not it is an interactive shell.

The following is not exactly an answer to this question (Chris Torek
answered it exactly in article <13851@mimsy.UUCP>), but it is related
and useful too.

A way to detect whether your .cshrc is executed the first time, or whether
it is executed with a "source .cshrc" e.g. after you edited it is:

< 1>  # Test if new csh.
< 2>  set temp = /tmp/prompt$$
< 3>  history 1 > $temp
< 4>  if (-z $temp) then
< 5>    # This is the first time .cshrc is executed
< 6>    alias lpr    `which lpr` \!\* \&
< 7>  else
< 8>    # This is when .cshrc is executed with 'source'
< 9>  endif
<10>  /bin/rm $temp
<11>  unset temp

Why is this usefull? A little example:

When no precautions are taken, on some machines the `which ...` on line 6 would
return "alias: /usr/local/lpr !* &" when you source your .cshrc.
From then on, you need paper and a pencil to make listings. 8-)

Hopefully someone can use it...

Kris Croes.
-- 
--------
K. CROES - IMEC - Leuven - Belgium   ..!prlb2!imec!croes

The Demon King sends a "rm -r /" to your shell.