Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!elroy.jpl.nasa.gov!sdd.hp.com!mips!daver!genco!rad
From: rad@genco.bungi.com (Bob Daniel)
Newsgroups: comp.unix.questions
Subject: Re: determining port id
Message-ID: <586@genco.bungi.com>
Date: 21 Mar 91 18:25:46 GMT
References: <1991Mar19.171708.18628@wciu.EDU>
Reply-To: rad@genco.bungi.com (Bob Daniel)
Organization: Gentry & Assoc. Excelsior Springs, MO
Lines: 36

In article <1991Mar19.171708.18628@wciu.EDU> george@wciu.wciu.edu (George Peavy) writes:
>I'm still learning shell programming, and have hit a snag that, so far, I 
>haven't been able to figure out.
>
>Here's what's happening:  I'm writing a menu program that, among other things,
>allows a user to select the option of up/downloading files to/from a PC.
>Since I also have terminals attached, I want to disallow this option unless
>the user is working from a port known to have a pc attached to it.
>
>
>	who am i | awk '{ print $2 }'
>
>The question is, how do I get this information into a place where I can
>test the value?  Is there a simpler way than my use of awk?

This is how I do it...

device=`tty`
port=`basename $device`

if [ "$port" = "ttyXX" ]
then
 ...
fi

or instead of 'if'....

case $port in
	ttyX1) 	foo1;;
	ttyX2) 	foo2;;
	  etc)	fooX;;
esac

______
The ` is accent marks, not single quotations.  I'm using AT&T SysV 3.2.3 so
this should work for you.