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: Assignment-like word shouldn't be subjected to tilde expansion in POSIX mode Date: Fri, 31 Jul 2020 10:03:22 -0400 Organization: ITS, Case Western Reserve University Lines: 32 Approved: bug-bash@gnu.org Message-ID: References: <5f066ef0-1fed-ad5b-d564-490268d32427@case.edu> <8ddc4816-f85e-97b3-5c51-9b55acdcaca5@case.edu> <26757.1595233713@jinx.noi.kre.to> <7963.1596120220@jinx.noi.kre.to> 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 1596204217 8561 209.51.188.17 (31 Jul 2020 14:03:37 GMT) X-Complaints-To: action@cs.stanford.edu Cc: chet.ramey@case.edu, bug-bash@gnu.org To: Robert Elz Envelope-to: bug-bash@gnu.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=case.edu; 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envelope-from=chet.ramey@case.edu; helo=mpv4-2015.case.edu X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/31 09:17:39 X-ACL-Warn: Detected OS = Linux 2.4.x-2.6.x [generic] X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: <5f066ef0-1fed-ad5b-d564-490268d32427@case.edu> <8ddc4816-f85e-97b3-5c51-9b55acdcaca5@case.edu> <26757.1595233713@jinx.noi.kre.to> <7963.1596120220@jinx.noi.kre.to> Xref: csiph.com gnu.bash.bug:16660 On 7/30/20 10:43 AM, Robert Elz wrote: > Date: Mon, 20 Jul 2020 10:11:59 -0400 > From: Chet Ramey > Message-ID: > > Sorry, didn't reply to this at the time... > > | You can make a case for the bash/ksh tilde expansion: the word > | expansion is ${PARAM:=WORD}, and the WORD is subject to tilde expansion > | according to the enumerated list in 2.6.2. > > Sure. but ... > > | Since the first character of WORD is a tilde, if you say the > | tilde-prefix stops at the `:', > > but that's true (in posix) only in an assignment. Either it is an > assignment, or it is not. It's not an assignment. Not according to the POSIX definition of a variable assignment. The terminating the tilde prefix at `:' is a bash extension. POSIX allows it because the behavior is undefined if the tilde prefix doesn't form a valid login name. Call it a bug if you like, but it's been there since at least bash-1.10. -- ``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/