GNU bug report logs - #66903
29.1; shell-mode directory tracking incorrectly handles double slashes

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Eshel Yaron <me <at> eshelyaron.com>
Cc: 66903 <at> debbugs.gnu.org, darkfeline <at> felesatra.moe
Subject: bug#66903: 29.1; shell-mode directory tracking incorrectly handles double slashes
Date: Fri, 03 Nov 2023 16:24:42 +0200

> From: Eshel Yaron <me <at> eshelyaron.com>
> Cc: darkfeline <at> felesatra.moe,  66903 <at> debbugs.gnu.org
> Date: Fri, 03 Nov 2023 13:35:46 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> I just wanted to note that this is not really an option with M-x shell,
> >> because it is the shell, and not Emacs, that interprets "cd" and changes
> >> directory.
> >
> > You assume that shell.el must send everything the user types verbatim
> > to the shell?
> 
> No, not "must" and not "everything", but if you think about it
> intercepting "cd" and altering its argument would make `M-x shell`
> incompatible with other shell interfaces, breaking valid command lines
> in weird ways.  Does that make sense?

It does to me.  To understand why, start Emacs in your HOME directory,
and then type this:

  M-x cd RET ~//bin RET

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