Path: csiph.com!goblin3!goblin1!goblin.stu.neva.ru!usenet.stanford.edu!not-for-mail From: Chet Ramey Newsgroups: gnu.bash.bug Subject: Re: Should [[ -v 1 ]] be supported? Date: Thu, 27 Dec 2018 13:22:15 -0500 Organization: ITS, Case Western Reserve University Lines: 16 Approved: bug-bash@gnu.org Message-ID: References: Reply-To: chet.ramey@case.edu NNTP-Posting-Host: lists.gnu.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Trace: usenet.stanford.edu 1545934948 30492 208.118.235.17 (27 Dec 2018 18:22:28 GMT) X-Complaints-To: action@cs.stanford.edu Cc: chet.ramey@case.edu To: Peng Yu , bug-bash Envelope-to: bug-bash@gnu.org X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:reply-to:cc:subject:to:references:from:openpgp :autocrypt:organization:message-id:date:user-agent:mime-version :in-reply-to:content-language:content-transfer-encoding; bh=U7tCr5Egr2sDT29+05Usub6VF/ktXUP6Mf7KrJPB4C4=; b=KXpVLPBpfdcRFRcoU74+9+Uyr2ti7JX4aqETiB1gpM0D+eJJWTfFgC9G/3WHc8ecUM i8BYF5wpBC+3f2NzWL+WRuSSM8uUuD8kz1hNpj/Eta2B7zU0eFn5f8sHf+ygcpR1+QyP HsuItz1N+un/rt1mFzUvSwFfYHo/kq0amlO2udHQZQDUYSmuFxTvwdJJaSKZbtD5p2NX CMq+bY0ERbpsX9i1yR4NyF0sMlBDGO3VWxuuy83t/i63ITnb68UnxFUhqErci7Oi6e5d N9rgHmc2s+27YNwL7S6W6cfQZBN9s8rh4Eax7FuCfTJc50ULXuRvbtJ6p4fLLr4b5mA/ WvYw== X-Gm-Message-State: AJcUuke0+CAlhbbW4Z419m5ONZNKJ4WP8rbwxsu035UgE9e70O08CzZE 9arGI07CPWddcBE8n+wsyFAL1aL3rByLVYEM45ssZjEmLGQPRRckXYDASFUYLeSwyJQA+rp7Pqn k9L8/ubKlws0= X-Received: by 2002:a25:ca4e:: with SMTP id a75mr18632106ybg.244.1545934939258; Thu, 27 Dec 2018 10:22:19 -0800 (PST) X-Google-Smtp-Source: ALg8bN7o5c2wWZQE4Y1bS/JjOf3q5RbLTUveBRhz8G0QEw358SuvUhxEYCs0H6ktDSs4MPYqQkUJ4Q== X-Received: by 2002:a25:ca4e:: with SMTP id a75mr18632095ybg.244.1545934939014; Thu, 27 Dec 2018 10:22:19 -0800 (PST) Openpgp: preference=signencrypt Autocrypt: addr=chet.ramey@case.edu; prefer-encrypt=mutual; keydata= xsDiBEEOsGwRBACFa0A1oa71HSZLWxAx0svXzhOZNQZOzqHmSuGOG92jIpQpr8DpvgRh40Yp AwdcXb8QG1J5yGAKeevNE1zCFaA725vGSdHUyypHouV0xoWwukYO6qlyyX+2BZU+okBUqoWQ koWxiYaCSfzB2Ln7pmdys1fJhcgBKf3VjWCjd2XJTwCgoFJOwyBFJdugjfwjSoRSwDOIMf0D /iQKqlWhIO1LGpMrGX0il0/x4zj0NAcSwAk7LaPZbN4UPjn5pqGEHBlf1+xDDQCkAoZ/VqES GZragl4VqJfxBr29Ag0UDvNbUbXoxQsARdero1M8GiAIRc50hj7HXFoERwenbNDJL86GPLAQ OTGOCa4W2o29nFfFjQrsrrYHzVtyA/9oyKvTeEMJ7NA3VJdWcmn7gOu0FxEmSNhSoV1T4vP2 1Wf7f5niCCRKQLNyUy0wEApQi4tSysdz+AbgAc0b/bHYVzIf2uO2lIEZQNNt+3g2bmXgloWm W5fsm/di50Gm1l1Na63d3RZ00SeFQos6WEwLUHEB0yp6KXluXLLIZitEJM0aQ2hldCBSYW1l eSA8Y2hldEBjd3J1LmVkdT7CYQQTEQIAIQIbAwYLCQgHAwIDFQIDAxYCAQIeAQIXgAUCQ+La kQIZAQAKCRC7WGnwZOp0q9rGAJ4sRGLmlF8klZTH75z7jyQScpU6aACeNMahjWIhumt4u96d 9mdMJqlabVnOwE0EQQ6wbxAEAJCukwDigRDPhAuI+lf+6P64lWanIFOXIndqhvU13cDbQ/Wt 5LwPzm2QTvd7F+fcHOgZ8KOFScbDpjJaRqwIybMTcIN0B2pBLX/C10W1aY+cUrXZgXUGVISE MmpaP9v02auToo7XXVEHC+XLO9IU7/xaU98FL69l6/K4xeNSBRM/AAMHA/wNAmRBpcyK0+Vg gZ5esQaIP/LyolAm2qwcmrd3dZi+g24s7yjV0EUwvRP7xHRDQFgkAo6++QbuecU/J90lxrVn QwucZmfz9zgWDkT/MpfB/CNRSKLFjhYq2yHmHWT6vEjw9Ry/hF6Pc0oh1a62USdfaKAiim0n VxxQmPmiRvtCmcJJBBgRAgAJBQJBDrBvAhsMAAoJELtYafBk6nSr43AAn2ZZFQg8Gs/zUzvX Mt7evaFqVTzcAJ0cHtKpP1i/4H4R9+OsYeQdxxWxTQ== User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 In-Reply-To: Content-Language: en-US X-Junkmail-Status: score=7/90, host=mpv2-2015.case.edu X-Junkmail-PrAS-Raw: score=7/90, refid=2.7.2:2018.12.27.180616:17:7.944, ip=, rules=__YOUTUBE_RCVD, __X_GOOGLE_DKIM_SIGNATURE, __HAS_REPLYTO, __HAS_CC_HDR, __PHISH_SPEAR_SUBJ_TEAM, __SUBJ_REPLY, __BOUNCE_CHALLENGE_SUBJ, __BOUNCE_NDR_SUBJ_EXEMPT, __TO_MALFORMED_2, __TO_NAME, __TO_NAME_DIFF_FROM_ACC, __REFERENCES, __HAS_FROM, FROM_EDU_TLD, __HAS_MSGID, __SANE_MSGID, DATE_TZ_NA, __USER_AGENT, __MOZILLA_USER_AGENT, __MIME_VERSION, __IN_REP_TO, __CT, __CT_TEXT_PLAIN, __CTE, __REPLYTO_SAMEAS_FROM_ADDY, __REPLYTO_SAMEAS_FROM_ACC, __FROM_DOMAIN_IN_ANY_CC1, __FROM_DOMAIN_IN_ANY_CC2, __REPLYTO_SAMEAS_FROM_DOMAIN, __ANY_URI, __URI_WITH_PATH, __URI_NO_WWW, __CP_URI_IN_BODY, __STOCK_PHRASE_7, __OEM_PRICE, __FRAUD_MONEY_CURRENCY_DOLLAR, __SUBJ_ALPHA_NEGATE, __URI_IN_BODY, __URI_NOT_IMG, __NO_HTML_TAG_RAW, BODY_SIZE_600_699, BODYTEXTP_SIZE_3000_LESS, __MIME_TEXT_P1, __MIME_TEXT_ONLY, __URI_NS, HTML_00_01, HTML_00_10, __FRAUD_MONEY_CURRENCY, [TRUNCATED], so=2010-03-03 19:42:08, dmn=2016-08-03-0138 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.4.x-2.6.x [generic] [fuzzy] X-Received-From: 129.22.103.227 X-BeenThere: bug-bash@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Bug reports for the GNU Bourne Again SHell List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com gnu.bash.bug:14967 On 12/26/18 10:49 PM, Peng Yu wrote: > Although [[ -z ${1+s} ]] and (($#)) works for testing if $1 is set, > neither of them are uniformly better performance wise. In this case, > should [[ -v 1 ]] be supported? So you're saying that neither of the existing options performs better than the other, though they both perform well, so we should add some new capability just because? That's a particularly poor argument. -- ``The lyf so short, the craft so long to lerne.'' - Chaucer ``Ars longa, vita brevis'' - Hippocrates Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/