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From: ghe@physics.orst.edu (Guangliang He)
Newsgroups: comp.unix.aix
Subject: ksh bug?
Message-ID: <21641@orstcs.CS.ORST.EDU>
Date: 8 Nov 90 01:47:43 GMT
Sender: usenet@orstcs.CS.ORST.EDU
Reply-To: ghe@physics.orst.edu (Guangliang He)
Organization: Dept. of Physics, OSU
Lines: 47

I'm starting to learn ksh on a RS/6000 with AIX 3.1. I typed in a piece of
script from  'The Korn Shell' by Morris I. Bolsky & David G. Korn. The
output of the script is not what I would expect. The shell script is on 
page 216 of the book.

Script started on Wed Nov 07 17:27:40 1990
1$ cat bug
#!/bin/ksh
while getopts :abo: c
do case $c in
    a)  aflag=1;;
    +a) aflag=;;
    b)  bflag=1;;
    +b) bflag=;;
    o)  oflag=$OPTARG;;
    :)  print -u2 "$0: $OPTARG requires a value:"
        exit 2;;
    \?) print -u2 "$0: unknow option $OPTARG"
        exit 2;;
    esac
done
shift OPTIND-1
2$ bug
3$ bug -a
4$ bug -b
5$ bug -c
./bug: unknow option 
6$ bug -o
./bug:  requires a value:
7$ bug -o 1
8$

script done on Wed Nov 07 17:28:08 1990

Look at command number 5 and number 6. It seems that $OPTARG was not
assigned even though the first argument after getopts begins with character
':'. This is different from what the book, and the man page on the AIX
machine. 

Any one can come up with reasonable answer?

Guangliang He
ghe@PHYSICS.ORST.EDU
                            Guangliang He

                            ghe@PHYSICS.ORST.EDU
                            hegl@ORSTVM.BITNET