Path: csiph.com!3.us.feeder.erje.net!feeder.erje.net!news.linkpendium.com!news.linkpendium.com!panix!usenet.stanford.edu!not-for-mail From: Ilkka Virta Newsgroups: gnu.bash.bug Subject: Re: Arithmetic evaluation of negative numbers with base prefix Date: Fri, 14 Jun 2019 21:30:15 +0300 Lines: 23 Approved: bug-bash@gnu.org Message-ID: References: <20190614141947.GB27242@tower> NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-Trace: usenet.stanford.edu 1560537059 4072 209.51.188.17 (14 Jun 2019 18:30:59 GMT) X-Complaints-To: action@cs.stanford.edu Cc: bug-bash@gnu.org, bash@packages.debian.org To: Jeremy Townshend Envelope-to: bug-bash@gnu.org User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 In-Reply-To: <20190614141947.GB27242@tower> Content-Language: en-US X-SASI-RCODE: 200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=iki.fi; h=subject:to:references:from:cc:message-id:date:mime-version:in-reply-to:content-type:content-transfer-encoding; s=smtp; bh=iwN4XWkBqpPglaq9oeTNaA2OWmEt2Al5kLah8HL8Sj4=; b=eZdw5Fe3j79OagmLCDmBoHfMkbAjoBvptrtSFkBv/8Agt7ycVniVcLM3CwCsInnl6D8muNFEziTBY2oKTNyh2GkRvj8qnbeGW84naQbTnch9D4xs+cfF6WSDm1v0lc5UKU4owAoqp4in7BhLcdXMhJYKlhtVp+bDU0BqmCpuEOCAHoxk04VJcN+JZggbHz4r6LxVXbrtM1gzj1SDGS84cSowOCRKPkrD1Lh01ej/c8r2l79PxcPcOVT+WcGMxmCMl1hGqK8Zq3iOqjpXleH4+MnhlgN09TOvuti3Tq3ITbNS9SiBarLnYesfK1TijTuMtXLCPE6rt5S97Wk9U4m2qw== X-detected-operating-system: by eggs.gnu.org: FreeBSD 8.x X-Received-From: 157.24.2.104 X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Mailman-Original-Message-ID: X-Mailman-Original-References: <20190614141947.GB27242@tower> Xref: csiph.com gnu.bash.bug:15050 On 14.6. 17:19, Jeremy Townshend wrote: > echo $((10#-1)) # -1 as expected Earlier discussion about the same on bug-bash: https://lists.gnu.org/archive/html/bug-bash/2018-07/msg00015.html Bash doesn't support the minus (or plus) sign following the 10#. I think the expression above seems to work in this case because 10# is treated as a constant number by itself (with a value of 0), and then the 1 is subtracted. try also e.g.: $ echo $((10#)) 0 > echo $((0-10#-1)) # -1 UNEXPECTED. Would expect 1. So this is 0-0-1 = -1 -- Ilkka Virta / itvirta@iki.fi