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: Bug on bash shell - $PWD (and consequentely prompt) not updated while renaming current folder. 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envelope-from=chet.ramey@case.edu; helo=mpv1-2015.case.edu X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/20 14:02:10 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=_AUTOLEARN 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: <4c262650-3c37-923f-53f1-358df8c0f9a1@case.edu> X-Mailman-Original-References: <051e2fbabf3a9912e5d4248efba0f02b@goncalo.pt> <6BF29BAB-6F57-4D88-85BC-56E1AA14F29F@larryv.me> Xref: csiph.com gnu.bash.bug:16419 On 6/20/20 1:28 PM, Lawrence Velázquez wrote: > Here's something fun though: > > $ PROMPT_COMMAND='cd .' > $ readlink /tmp > private/tmp > $ mkdir /tmp/old > $ cd /tmp/old > $ echo "$PWD" > /tmp/old > $ mv /tmp/old /tmp/new > $ echo "$PWD" > /private/tmp/new > > Not wrong, but maybe unexpected to some. It's a way to make sure PWD is correct after a `cd'. Without options, `cd' canonicalizes its pathname argument in the way POSIX describes in https://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html#tag_20_14 That converts it to /tmp/old ("." -> "/tmp/old/." -> "/tmp/old") Since chdir to "/tmp/old" fails, bash falls back to chdir to ".", which succeeds, and then recanonicalizes PWD to the true directory pathname, as would be returned by `pwd -P'. -- ``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/