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Re: Bash manual - interactive shell definition
From: |
Ken Irving |
Subject: |
Re: Bash manual - interactive shell definition |
Date: |
Fri, 12 Mar 2010 00:55:04 -0900 |
User-agent: |
Mutt/1.5.20 (2009-06-14) |
On Fri, Mar 12, 2010 at 12:50:26AM -0900, Ken Irving wrote:
> On Fri, Mar 12, 2010 at 09:16:05AM +0000, Marc Herbert wrote:
> > >> Could this sentence:
> > >>
> > >> "An interactive shell is one started without non-option arguments,
> > >> unless -sis specified, without specifying the
> > >> -c option, and whose input and error output are both connected to
> > >> terminals
> > >> (as determined by isatty(3)), or one started with the -i option. "
> > >>
> > >> be any more confusing?
> > >
> > > Is seems pretty clearly stated to me.
> >
> > Please enlighten us with the priority of English boolean operators.
> >
> > I have never seen a natural language sentence with so many boolean
> > operators.
>
> Well I can try.
>
> An interactive shell is one started without non-option arguments,
>
> If there are any arguments then they must be options...
>
> unless -s is specified,
>
> bash(1) says: "If the -s option is present ... then commands are read
> from the standard input", which clearly is not interactive.
>
> without specifying the -c option,
>
> The -c option is accompanied by a string containing the commands to be run,
> so the shell is not interactive.
>
> and whose input and error output are both connected to terminals (...),
>
> Without which there'd be nothing for it to interact with.
>
> or one started with the -i option.
I let the previous reply fly before ready...
The -i option would seem to override the other conditions, declaring the
shell to be interactive even if it wouldn't otherwise be.
I'm not saying the sentence is trivial to parse, but I don't see any
ambiguities in the definition.
Ken
- Bash manual - interactive shell definition, Robert Cratchit, 2010/03/11
- Re: Bash manual - interactive shell definition, Ken Irving, 2010/03/12
- Re: Bash manual - interactive shell definition, Marc Herbert, 2010/03/12
- Re: Bash manual - interactive shell definition, Ken Irving, 2010/03/12
- Re: Bash manual - interactive shell definition,
Ken Irving <=
- Re: Bash manual - interactive shell definition, Pierre Gaston, 2010/03/12
- Re: Bash manual - interactive shell definition, Ken Irving, 2010/03/12
- Re: Bash manual - interactive shell definition, Pierre Gaston, 2010/03/12
- Re: Bash manual - interactive shell definition, Pierre Gaston, 2010/03/12
Re: Bash manual - interactive shell definition, Chet Ramey, 2010/03/12