Package: bash Version: 4.4-4+b1 Severity: normal Usertags: home The HOME environment variable does not have to be present, programs must fall back to the value in the passwd file. bash does not do this in the following two places. The documentation for both of these says that the HOME shell variable is used but bash should still change that, especially because the tilde expansion feature of bash already does.
When running cd without any argument: > if dir is not supplied, the value of the HOME shell variable is the default. POSIX leaves cd with $HOME unset as implementation defined: http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html When expanding \w or \W in PS1: > "with $HOME abbreviated with a tilde" PS1 \w \W seem to be bash-specific features: http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_05_03 pabs@chianamo:~$ export PS1='\u@\h \w \W \$ ' pabs@chianamo ~ ~ $ echo $PS1 \u@\h \w \W \$ pabs@chianamo ~ ~ $ unset HOME pabs@chianamo /home/pabs pabs $ cd -su: cd: HOME not set pabs@chianamo /home/pabs pabs $ echo ~ /home/pabs pabs@chianamo /home/pabs pabs $ getent passwd pabs | cut -d: -f6 /home/pabs -- System Information: Debian Release: 9.0 APT prefers testing-debug APT policy: (900, 'testing-debug'), (900, 'testing'), (860, 'testing-proposed-updates'), (800, 'unstable-debug'), (800, 'unstable'), (790, 'buildd-unstable'), (700, 'experimental-debug'), (700, 'experimental'), (690, 'buildd-experimental') Architecture: amd64 (x86_64) Kernel: Linux 4.9.0-2-amd64 (SMP w/4 CPU cores) Locale: LANG=en_AU.utf8, LC_CTYPE=en_AU.utf8 (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages bash depends on: ii base-files 9.8 ii dash 0.5.8-2.4 ii debianutils 4.8.1 ii libc6 2.24-9 ii libtinfo5 6.0+20161126-1 Versions of packages bash recommends: ii bash-completion 1:2.1-4.3 Versions of packages bash suggests: pn bash-doc <none> -- bye, pabs https://wiki.debian.org/PaulWise
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