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Date:      Fri, 10 Oct 2014 19:10:03 -0500
From:      "William A. Mahaffey III" <wam@hiwaay.net>
To:        freebsd-questions@freebsd.org
Subject:   Re: sh man page ....
Message-ID:  <5438755B.2000108@hiwaay.net>
In-Reply-To: <20141010183814.3ae32a05@gumby.homeunix.com>
References:  <5437FB8B.9080008@hiwaay.net> <20141010183814.3ae32a05@gumby.homeunix.com>

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On 10/10/14 12:38, RW wrote:
> On Fri, 10 Oct 2014 10:30:19 -0500
> William A. Mahaffey III wrote:
>
>>
>> I have a FBSD 9.3 desktop that supplanted a Linux FC14 desktop used
>> for web access, some light development, & other day-to-day tasks
>> (i.e. my daily driver, so to speak). I had a bunch of shell scripts
>> written to use Linux sh, which was in fact bash, which means it had a
>> superset of the arithmetic operators that traditional sh had. When I
>> use these scripts under sh under FBSD 9.3, they largely work, though
>> there are some minor differences (empty strings evaluate to zero (0)
>> under bash, error under sh).
> Can you give an example?
>
> $ sh
> $ echo $((1+c))
> 1
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Straight out of the script which is failing. Under linux, if I call the 
script w/ no '-s #' option, the variable 'slept' is not set, & linux (or 
more accurately linux bash) evaluates that to the value oif zero (0).


[wam@kabini1, ~, 7:07:22pm] 386 % sh
$ if [ 0 -lt $(($slept)) ] ; then echo -n "$cmd: sleeping $slept secs 
...." ; sleep $(($slept)) ; echo " done." ; fi
arithmetic expression: expecting primary: ""
[wam@kabini1, ~, 7:07:45pm] 387 %


-- 

	William A. Mahaffey III

  ----------------------------------------------------------------------

	"The M1 Garand is without doubt the finest implement of war
	 ever devised by man."
                            -- Gen. George S. Patton Jr.




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