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 > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" > 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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