> The HOME environment variable does not have to be present, programs > must fall back to the value in the passwd file. $SHELL does not do this > in the following two places. > > * When running cd without any argument > * When expanding tilde (~) characters
Nope, there's nothing that says they "must" fall back to anything. The very docs you linked to: > http://pubs.opengroup.org/onlinepubs/9699919799/utilities/cd.html > http://pubs.opengroup.org/onlinepubs/009695399/utilities/xcu_chap02.html#tag_02_06_01 explicitly say the results are unspecified. $HOME should be set by the login environment, but if it's not set, you get to keep the pieces. You filed copies of this bug on three shells: busybox[sh], dash, bash. Their policies are: * busybox: no superfluous features are added, often even required but non-important features get skipped * dash: POSIXLY_CORRECT, even when POSIX and common sense disagree Upstreams of those two will thus almost certainly reject such a change. * bash: no particular policy Yet, because the two other shells don't invent a fallback for missing $HOME, adding it bash would introduce a difference in behaviour that can be avoided by keeping status quo. Thus, while I understand your reason (extra robustness for user error), I'd recommend WONTFIXing all three copies of this bug. Please say if I missed something. -- ⢀⣴⠾⠻⢶⣦⠀ Meow! ⣾⠁⢠⠒⠀⣿⡁ ⢿⡄⠘⠷⠚⠋⠀ Collisions shmolisions, let's see them find a collision or second ⠈⠳⣄⠀⠀⠀⠀ preimage for double rot13!
