SUMMARY (Part 2): How to replace the Bourne shell with the Korn shell

CAVEAT EMPTOR: I've done SOME testing, and so far this does seem to work
- reboots and all. Judge for yourself how backwards compatible you think
the Korn shell really is with the Bourne shell.

- John

Enjoy! (or puke) ...

# df -k

Filesystem            kbytes    used   avail capacity  Mounted on
/proc                      0       0       0     0%    /proc
/dev/dsk/c0d0s0      1588589  537224 1003708    35%    /
fd                         0       0       0     0%    /dev/fd
/dev/dsk/c0d0s5      2896359  575284 2263148    21%    /var
/dev/dsk/c0d0s7       127703    1041  113892     1%    /export/home
/dev/dsk/c0d0s4       966319   89246  819094    10%    /opt
swap                 2911940       8 2911932     1%    /tmp
/dev/dsk/c0d0s3         5807    1042    4185    20%    /shells

# cat /.shells/README

IT'S A SHELL GAME ...

/.shells/
=========
/.shells/README is this file
/.shells/noshell is nice
/.shells/sh was /sbin/sh
/.shells/bsh was /usr/bin/sh
/.shells/ksh was /usr/bin/ksh

When /shells filesystem is NOT mounted:
=======================================
/shells/sh -> /.shells/sh

When /shells filesystem IS mounted:
===================================
/shells/sh -> /.shells/ksh

Other Links:
============
/sbin/sh -> /shells/sh
/sbin/noshell -> /.shells/noshell
/usr/bin/ksh -> /.shells/ksh
/usr/bin/sh -> /.shells/ksh
/usr/bin/rksh -> /.shells/ksh
/usr/lib/rsh -> /.shells/ksh

# cat /etc/profile

if [ -x /opt/logins/bin/disable_interrupts ] \
&& [ -x /opt/logins/bin/enable_interrupts ]
then
    . /opt/logins/bin/disable_interrupts
    case ${LOGNAME:-undefined} in
    undefined)
        print "LOGNAME is undefined!"
        . /opt/logins/bin/enable_interrupts
        sleep 5
        exit 1
        ;;
    someone | special)
        ;;
    *)
        ENVFILE=/etc/.kshrc
        ENV='${ENVFILE[(_$-=1)+(_=0)-(_$-!=_${-%%*i*})]}'
        readonly ENVFILE ENV
        export ENVFILE ENV
        ;;
    esac
    . /opt/logins/bin/enable_interrupts
fi
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