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Re: [Help-bash] Is there a syntax to declare -p address@hidden
From: |
Peng Yu |
Subject: |
Re: [Help-bash] Is there a syntax to declare -p address@hidden |
Date: |
Thu, 6 Dec 2018 22:12:33 -0600 |
On Wed, Dec 5, 2018 at 8:40 AM Tadeus Prastowo <address@hidden> wrote:
>
> On Wed, Dec 5, 2018 at 12:31 AM Peng Yu <address@hidden> wrote:
>
> [...]
>
> > $ ./main.sh
> > set -- 1 '2 3'
> > echo ${@@A}
> > set -- '1' '2 3'
> > echo "${@@A}"
> > set -- '1' '2 3'
> >
> >
> > Where is it documented?
>
> https://www.gnu.org/software/bash/manual/bashref.html#Shell-Parameter-Expansion,
> particularly as quoted below:
>
> address@hidden
> The expansion is either a transformation of the value of parameter
> or information about parameter itself, depending on the value of
> operator. Each operator is a single letter:
> [...]
> A
> The expansion is a string in the form of an assignment statement
> or declare command that, if evaluated, will recreate parameter with
> its attributes and value.
> [...]
> If parameter is address@hidden or ‘*’, the operation is applied to each
> positional parameter in turn, and the expansion is the resultant list.
> [...]
> The result of the expansion is subject to word splitting and
> pathname expansion as described below.
How to understand why `echo address@hidden only print an empty line?
$ echo "address@hidden"
$ echo "${$}"
613
$ echo address@hidden
$ echo address@hidden
declare -ir BASHPID='440'
--
Regards,
Peng
- [Help-bash] Is there a syntax to declare -p address@hidden, Peng Yu, 2018/12/04
- Re: [Help-bash] Is there a syntax to declare -p address@hidden, Grisha Levit, 2018/12/04
- Re: [Help-bash] Is there a syntax to declare -p address@hidden, Peng Yu, 2018/12/04
- Re: [Help-bash] Is there a syntax to declare -p address@hidden, Tadeus Prastowo, 2018/12/05
- Re: [Help-bash] Is there a syntax to declare -p address@hidden, Peng Yu, 2018/12/05
- Re: [Help-bash] Is there a syntax to declare -p address@hidden,
Peng Yu <=
- Re: [Help-bash] Is there a syntax to declare -p address@hidden, Dennis Williamson, 2018/12/06
- Re: [Help-bash] Is there a syntax to declare -p address@hidden, Peng Yu, 2018/12/06
- Re: [Help-bash] Is there a syntax to declare -p address@hidden, Dennis Williamson, 2018/12/06
- Re: [Help-bash] Is there a syntax to declare -p address@hidden, Chet Ramey, 2018/12/07
Re: [Help-bash] Is there a syntax to declare -p address@hidden, Chris F.A. Johnson, 2018/12/04