Path: csiph.com!xmission!news.snarked.org!news.linkpendium.com!news.linkpendium.com!panix!usenet.stanford.edu!not-for-mail From: Chet Ramey Newsgroups: gnu.bash.bug Subject: Re: shouldn't it the comma operator has the lowerest precedence in the shell arithmetic expression? Date: Wed, 2 Oct 2019 09:34:08 -0400 Lines: 27 Approved: bug-bash@gnu.org Message-ID: References: <3f1d2555-dd46-9c8f-924b-8d6196358053@case.edu> 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 1570023258 3078 209.51.188.17 (2 Oct 2019 13:34:18 GMT) X-Complaints-To: action@cs.stanford.edu Cc: chet.ramey@case.edu To: hk , bug-bash@gnu.org Envelope-to: bug-bash@gnu.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=case.edu; s=smtp-primary; t=1570023250; bh=4oq+O/qfIIXGrI+mzia76CmMT440z8ivYOmQBPHJFsk=; h=Reply-To:Cc:Subject:To:References:From:Message-ID:Date: MIME-Version:In-Reply-To:Content-Type:Content-Transfer-Encoding; b=LIKfdbTaSqu1HVXDvEVAd4TAwvfRP7YTS2Lqb7PD/GVN/o/elVNEB3SGcoLZSj3M3b bNZ3SF6hbBc+/0Rh+Nry4tBzlzqLJ3KOLlTR5ozh4FBoYQkpUOy52kV8ij0yz9K3iO8 WIPq/STPgJwjnBWxkVWUM2B4fEkqOghdIrUm9eHTJV7D4dlzAjSQgbbpjcHUvDiyAOD ndB3xi4RCSSU+ZIJ+cve+wn3VF4FiRj3s4e09HqtYXzl8/CvQejopitr8IyLyHCjVH2 Rmz38JUO615HAIV7eOSF5mfb5RDBxyGaJ6JkGsQ2qf9vrzdQFvfyfT7+M0k9rRicWjh l8MNtVmg== DKIM-Signature: v=1; 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Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 In-Reply-To: Content-Language: en-US X-Junkmail-Status: score=7/90, host=mpv4-2015.case.edu X-Junkmail-PrAS-Raw: score=7/90, refid=2.7.2:2019.10.2.123317:17:7.944, ip=, rules=DKIM_SIGNATURE, __HAS_REPLYTO, __HAS_CC_HDR, __SUBJ_REPLY, __BOUNCE_CHALLENGE_SUBJ, __BOUNCE_NDR_SUBJ_EXEMPT, __TO_MALFORMED_2, __TO_NAME, __HAS_REFERENCES, __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, __DKIM_ALIGNS_1, __DKIM_ALIGNS_2, __ANY_URI, __URI_WITH_PATH, __URI_NO_WWW, __CP_URI_IN_BODY, __SUBJ_ALPHA_NEGATE, __URI_IN_BODY, __URI_NOT_IMG, __FORWARDED_MSG, __BODY_NO_MAILTO, __NO_HTML_TAG_RAW, BODYTEXTP_SIZE_3000_LESS, BODY_SIZE_800_899, __MIME_TEXT_P1, __MIME_TEXT_ONLY, __URI_NS, HTML_00_01, HTML_00_10, DKIM_ALIGNS, BODY_SIZE_5000_LESS, IN_REP_TO, MSG_THREAD, [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: 129.22.103.195 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: <3f1d2555-dd46-9c8f-924b-8d6196358053@case.edu> X-Mailman-Original-References: Xref: csiph.com gnu.bash.bug:15455 On 10/1/19 8:35 PM, hk wrote: > Configuration Information : > Bash Version: 5.0 > Patch Level: 0 > Release Status: release > > Description: > the code snippet from expr.c starting from line 141: > >> /* This should be the function corresponding to the operator with the >> highest precedence. */ >> #define EXP_HIGHEST expcomma > > > Am I understanding it wrong or is it a typo? The bash arithmetic parser does things in reverse order, in a way. So the comma operator is the first thing you call, and it calls functions that implement the other operators in ascending priority order. You didn't misunderstand it. -- ``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/