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Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime.
From: |
Ralph Corderoy |
Subject: |
Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime. |
Date: |
Wed, 18 Jan 2017 13:02:09 +0000 |
Hi Jon,
> David wrote:
> > > It's very unintuitive, well, wrong, that a `cd' command at a
> > > command's prompt doesn't change the current working directory as
> > > far as all other commands are concerned. That's not how other
> > > Unix commands that provide cd work. If it can't be fixed then
> > > whatnow(1) could do with pointing it out.
> >
> > Well, yeah.
>
> Well, since I'm responsible for this, I don't agree with you. Yes, it
> might be unintuitive if you're not familiar with UNIX, but it is how
> it works. If you type
>
> sh
> cd foo
> exit
>
> you will not be in foo. Whatnow is a subshell.
I have some familiarity with Unix. ;-)
My complaint, and whatnow(1)'s behaviour, is, in normal sh terms, more
akin to
1 $ pwd
2 /
3 $ mkdir foo
4 $ date >foo/bar
5 $ cd foo
6 $ pwd
7 /foo
8 $ ls
9 bar
10 $ cat bar
11 cat: bar: No such file or directory
12 $ cat foo/bar
13 2017-01-18 12:51:06 +0000 Wed
It's like a sh(1) that implements its built-in `cd' without calling
chdir(2), instead tracking cwd as a string to supplement other commands,
but only some of them. Thus, 6 and 8 "lie" that we've chdir'd, yet 10's
cat, not one of the annointed commands, can't find bar and must instead
must give a path as if the cd didn't happen. cat here is `mime' at the
whatnow prompt.
When implementing this, was there a reason whatnow doesn't implement
`cd' with chdir, as normal Unix commands that offer cd do, and instead
"fake" it for `pwd', `ls', and `attach', but not `mime', etc?
--
Cheers, Ralph.
https://plus.google.com/+RalphCorderoy
- [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Ralph Corderoy, 2017/01/17
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., David Levine, 2017/01/17
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Jon Steinhart, 2017/01/17
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime.,
Ralph Corderoy <=
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Jon Steinhart, 2017/01/18
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Ralph Corderoy, 2017/01/18
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Jon Steinhart, 2017/01/18
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Paul Fox, 2017/01/19
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Ralph Corderoy, 2017/01/19
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., David Levine, 2017/01/18
- Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Ralph Corderoy, 2017/01/19
Re: [Nmh-workers] whatnow(1)'s cd Doesn't Affect it's mime., Ralph Corderoy, 2017/01/18