On Mon, 2 Dec 2013, Matteo Cavalleri wrote:
> 1) “and” and “or” commands:
>
> i suppose that:
>
> (and|or) does not change the current exit status.
>
> does really mean:
>
> (and|or) does not change the current exit status if the command is not
> executed
>
> because that’s what i see from my experiments. I think this behavior is
> nice, but it took me a while to figure it out, because that sentence in
> the documentation is a bit misleading in my opinion.
You're right - there should be some clarification.
Although (and|or) do not change the exit status, the commands that are run
may. However, if you run a command which does not change the exit status
either, it will remain unchanged. The best example of this is `set`:
~> false; or set bla m; echo $status
1
~> true; and set bla m; echo $status
0
~> true; and false; echo $status
1
> 2) special variables
>
> in the "special variables” paragraph i see no mentions of the variable
> $version, but looks like it’s some kind of special, read-only variable,
> because i can screw the shell with this simple line:
>
> function test; set -l version 10; echo $version; end
>
> after defining it all i get is a long list of errors every time i press enter.
If you define a new function called `test`, you're gonna have a bad time.
The shell uses test all over the place - see `help test`. Defining a
function takes precedence over the builtin command, so functions calling
test will fail.
This comes up so often that I wonder if it would be better to replace
every use of test in the source with 'builtin test' (error-prone) or to
disallow the loading of functions named test (inelegant).
> by the way wouldn’t it be better to call it “fish_version”?
We have both! $version, like tcsh, and $FISH_VERSION, like bash and zsh.
They are unexported, read-only variables. They need adding to the
documentation; I will do so.
David Adam
zanc...@ucc.gu.uwa.edu.au
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