Hi Jason,
On Fri, Nov 20, 2020 at 02:52:09PM +0000, cygwin wrote:
>
> Good day -
>
> I am using a fairly up-to-date Cygwin:
> release: cygwin
> arch: x86_64
> setup-timestamp: 1603379981
> include-setup: setup <2.878 not supported
> setup-minimum-version: 2.895
> setup-version: 2.905
> , bash version : 4.4.12(3)-release
> on Windows 10 :
> Edition Windows 10 Pro
> Version 20H2
> OS build 19042.630
> Experience Windows Feature Experience Pack 120.2212.31.0
> , which I am forced to use for a work related Visual Studio project,
> , running in a Qemu/KVM VM under Fedora-32 on a modern X86_64 Dell XPS
> laptop, and am experiencing some strange and disconcerting behaviour:
>
> I am a complete novice Windows user, I have used only BSD / Solaris
> / AIX / HP-UX / MacOSX / z/OS or Linux since 1990, so I am an advanced UNIX
> shell script user & C/C++ + LISP + PERL programmer (I prefer LISP nowadays).
>
> I have to run a script with an alternate setting of $HOME, so I do:
>
> $ HOME="C:\\USERS\\JVD\\" sbcl --script "C:\\${path-to-my-script}.lisp"
>
> This works, but now:
>
> $ cd ~
> -bash: cd: "C:\\USERS\\JVD\\" sbcl --script
> "C:\\${path-to-my-script}.lisp": No such file or directory
> $ echo $HOME
> /home/JVD
>
> This is very weird! "$HOME" is still set to its /etc/bash.bashrc set
> default, but evaluation of 'echo ~', which I thought should be
> equivalent to 'echo $HOME', yields the last command to be prefixed
> by a command-specific HOME=... setting .
>
> I think this is a bug. Since setting HOME=... has no effect now,
> (it still has its correct value),
> use of '~' is now effectively disabled for this shell session .
>
> What is 'echo ~' doing other than 'echo $HOME' ?
If you had tried 'set -x' you would have seen what it does: tilde expansion is
done by bash before the echo command is invoked. So you would see something like
'echo /home/jvd'.
Could it be that 'sbcl' has popped a new bash command level?
I can't reproduce your issue with a simple command instead of 'sbcl' e.g.
> 09:33:42$ HOME="C:\\USERS\\DUNCAN\\" pwd
> /home/dunc
> 09:34:02$ echo ~
> /home/dunc
>
[...]
>
Cheers ... Duncan.
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