On 2014-10-08, at 04:29, carr...@nationwide.com wrote:
>
> Some things I encounter is when i have developers working in OMVS the
> first thing they do is bring over their Linux or AIX scripts and they do
> not work. They try to use ksh or bash and can't so immediately we get a
> black eye for using such an old antiquated shell
>
Users who don't comply with standards shouldn't expect portability.
I'll attach some "ls -lLi" output that shows that several UNIX-like
systems use dash:
uname -a; ls -Lli `whence rexx regina` /bin/*sh | sort -nk 6,6
as an alias for /bin/sh. Dash is lightweight and POSIX-compliant
with few extensions. This enforces that scripts that begin "#!/bin/sh"
use dash, enforcing POSIX compliance. They also use dash as the
interpreter for the system() function for reasons of performance.
Ubuntu claims this significantly improves startup speed.
On 2014-10-07, at 10:30, Mike Schwab wrote:
> If Bash was added to the POSIX standard, they would have to support it.
>
No. It appears that having once qualified for UNIX branding, OMVS feels
no need to comply with updates to the standard. Notable and annoying
examples are the -L and -P options to cd and pwd, and that the default
behavior of pwd is -P-like ratner than -L-like as POSIX requires.
I hope not to see bash added to POSIX. Bash is bloatware; over twice
as large as Rexx on most systems, and almost ten times as large as dash.
Most installations of dash omit POSIX command line editing (it's an
option), which I find annoying. But they expect dash not to be used as
an interactive shell. I don't know how much command line editing would
bloat dash.
502 $ uname -a; ls -Lli `whence rexx regina` /bin/*sh | sort -nk 6,6
Darwin PaulGilm.local 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:33:36
PDT 2011; root:xnu-1504.15.3~1/RELEASE_I386 i386
20905756 -rwxr-xr-x 1 root wheel 53560 Oct 2 2010 /usr/bin/regina
8011852 -rwxr-xr-x 2 root wheel 767200 Feb 10 2010 /bin/csh
8011852 -rwxr-xr-x 2 root wheel 767200 Feb 10 2010 /bin/tcsh
8046173 -rwxr-xr-x 1 root wheel 1346544 Feb 4 2010 /bin/bash
8046219 -r-xr-xr-x 1 root wheel 1346624 Feb 4 2010 /bin/sh
6662774 -rwxr-xr-x 1 root wheel 1597200 May 11 2009 /bin/zsh
20905758 -rwxr-xr-x 1 root wheel 1866360 Oct 2 2010 /usr/bin/rexx
6661547 -r-xr-xr-x 1 root wheel 2186880 May 18 2009 /bin/ksh
503 $ uname -a; ls -Lli `whence rexx regina` /bin/*sh | sort -nk 6,6
Linux Linux-Mac 3.13.0-36-generic #63-Ubuntu SMP Wed Sep 3 21:30:45 UTC 2014
i686 i686 i686 GNU/Linux
135180 -rwxr-xr-x 1 root root 5436 Jun 30 2012 /usr/bin/regina
4909 -rwxr-xr-x 1 root root 112204 Feb 19 2014 /bin/dash
4909 -rwxr-xr-x 1 root root 112204 Feb 19 2014 /bin/sh
135165 -rwxr-xr-x 1 root root 403996 Jun 30 2012 /usr/bin/rexx
4824 -rwxr-xr-x 1 root root 986672 Sep 27 02:05 /bin/bash
4824 -rwxr-xr-x 1 root root 986672 Sep 27 02:05 /bin/rbash
50 -rwxr-xr-x 1 root root 1713424 Nov 14 2013 /bin/static-sh
507 $ uname -a; ls -Lli `whence rexx regina` /bin/*sh | sort -nk 6,6
Linux raspberrypi 3.12.28+ #709 PREEMPT Mon Sep 8 15:28:00 BST 2014 armv6l
GNU/Linux
4765 -rwxr-xr-x 1 root root 5544 Jul 11 2012 /usr/bin/regina
434 -rwxr-xr-x 1 root root 88340 Mar 29 2012 /bin/dash
434 -rwxr-xr-x 1 root root 88340 Mar 29 2012 /bin/sh
4758 -rwxr-xr-x 1 root root 342620 Jul 11 2012 /usr/bin/rexx
14879 -rwxr-xr-x 1 root root 813992 Sep 25 14:55 /bin/bash
14879 -rwxr-xr-x 1 root root 813992 Sep 25 14:55 /bin/rbash
512 $ uname -a; ls -Lli `whence rexx regina` /bin/*sh | sort -nk 6,6
Linux linaro-alip 3.0.57+ #26 PREEMPT Sun Mar 3 09:44:37 EST 2013 armv7l armv7l
armv7l GNU/Linux
2358 -rwxr-xr-x 1 root root 5512 Dec 1 2011 /usr/bin/regina
14 -rwxr-xr-x 1 root root 63484 Mar 29 2012 /bin/dash
14 -rwxr-xr-x 1 root root 63484 Mar 29 2012 /bin/sh
276 -rwxr-xr-x 1 root root 77592 Dec 1 2011 /bin/posh
2221 -rwxr-xr-x 1 root root 252464 Dec 1 2011 /usr/bin/rexx
1767 -rwxr-xr-x 1 root root 605140 Sep 27 02:08 /bin/bash
1767 -rwxr-xr-x 1 root root 605140 Sep 27 02:08 /bin/rbash
-- gil
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