Re: [TUHS] moving directories in svr2

[Arthur Krewat <krewat@kilonet.net>]

On 12/31/2021 10:53 AM, Adam Thornton wrote:
> Slightly older, but also slightly more fundamental to the system, you 
> need look no farther than Solaris's `/bin/sh` for an illustrated 
> example of the pros and cons of maintaining backwards compatibility.  
> It was a pain by, say, 2007, to have to check if you were running on 
> SunOS and use `/usr/xpg4/bin/sh` (IIRC) if you wanted a POSIX 
> shell--by that point the other major vendors (and Linux) had something 
> POSIX as the default shell.  But Sun had an installed user base with a 
> bunch of shell scripts that depended on pre-POSIX semantics.

Did some checking, at the risk of going off-topic:

Solaris 11.4 (current patch level, 11.4.40.107.3, December 2021): 
/bin/sh looks to be Korn shell.

root@mercury:~# ls -l /bin/sh
-r-xr-xr-x   5 root     bin      2946936 Dec 22 10:46 /bin/sh
root@mercury:~# strings /bin/sh | grep Korn | head -1
][-author?David Korn <dgk@research.att.com>][-copyright?Copyright (c) 
1982-2021 AT&T Intellectual 
Property][-license?http://www.eclipse.org/org/documents/epl-v10.html][--catalog?libshell][+NAME?
root@mercury:~# sh --version
   version         sh (AT&T Research) 93u+ 2012-08-01

Solaris 11.3: /bin/sh seems to be Korn shell.

medusa# ls -l /bin/sh
lrwxrwxrwx   1 root     root          11 Jun 11  2016 /bin/sh -> amd64/ksh93
medusa# ls -lL /bin/sh
-r-xr-xr-x   8 root     bin      2601344 Jul  1  2016 /bin/sh
medusa# strings !$ | grep dgk | head -1
strings /bin/sh | grep dgk | head -1
][-author?David Korn <dgk@research.att.com>][-copyright?Copyright (c) 
1982-2016 AT&T Intellectual 
Property][-license?http://www.eclipse.org/org/documents/epl-v10.html][--catalog?libshell][+NAME?
medusa# sh --version
   version         sh (AT&T Research) 93u+ 2012-08-01


Solaris 10: (seems /bin/sh is still Bourne at this point):

zeus<@medusa.kilonet.net># ls -l /bin/sh
lrwxrwxrwx   1 root     root          13 Jun  6  2014 /bin/sh -> 
../../sbin/sh
zeus<@medusa.kilonet.net># ls -lL /bin/sh
-r-xr-xr-x   1 root     root       82456 Sep 22  2010 /bin/sh

sh --version just opens a new shell.