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[Launchpad Bug Tracker <1614080@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package bash - 4.4.18-2ubuntu1.1

---------------
bash (4.4.18-2ubuntu1.1) bionic; urgency=medium

  * Resurrect "Set the default path to comply with Debian policy" in
    deb-bash-config.diff which went missing since 4.2+dfsg-1 or so.
    LP: #1792004 LP: #1614080 Closes: #781367
  * Add autopkgtest for the built-in path.

 -- Dimitri John Ledkov <xnox@xxxxxxxxxx>  Fri, 03 May 2019 14:50:32
+0100

** Changed in: bash (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1614080

Title:
  PATH contains dot when PATH is unset before running bash

Status in bash package in Ubuntu:
  Fix Released
Status in bash source package in Precise:
  Fix Released
Status in bash source package in Trusty:
  Won't Fix
Status in bash source package in Xenial:
  Fix Committed
Status in bash source package in Bionic:
  Fix Released
Status in bash source package in Cosmic:
  Fix Released
Status in bash source package in Disco:
  Fix Released
Status in bash source package in Eoan:
  Fix Released
Status in bash package in Debian:
  New

Bug description:
  [Impact]

   * The fallback path built into bash contains '.' which leads to
  unexpected addition of the current working directory. It should not be
  there, just like it isnt' in pre-precise and cosmic+.

  [Test Case]

   * $ env -u PATH /bin/bash -c 'echo $PATH'

  Should not have '.' as any component. Nor should there be any empty
  components, i.e. '::'.

  [Regression Potential]

   * Normally PATH is always set by either init, systemd, or any other
  hypervisor. Thus this only affects executions under bash, when it was
  started without any environment - e.g. booting with 'init=/bin/bash'.

  [Other Info]
   
   * Original bug report.

  On ubuntu 16.04 (but also 14.04), running bash with PATH unset always
  adds '.' to PATH:

  philippe@pv-desktop:~$ echo $PATH
  /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games
  philippe@pv-desktop:~$ unset PATH
  philippe@pv-desktop:~$ /bin/bash
  philippe@pv-desktop:~$ echo $PATH
  /usr/local/bin:/usr/local/sbin:/usr/bin:/usr/sbin:/bin:/sbin:.

  Even when testing in a virtual machine / docker, and erasing
  /root/.profile /root/.bashrc /etc/profile /etc/bash.bashrc the problem
  still happens.

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