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Re: nofork command substitution
From: |
Chet Ramey |
Subject: |
Re: nofork command substitution |
Date: |
Thu, 25 May 2023 10:17:01 -0400 |
User-agent: |
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.11.0 |
On 5/25/23 8:13 AM, Robert Elz wrote:
Note that ${C } is not a group - it is syntax that delimits a command
substituition in a word, and what's in a command substitution is a list
(which can contain groups, or be one, but isn't required to be).
There's not any real difference. A group command is
'{' compound_list '}',
a nofork command substitution is
'${' compound_list '}',
and a command substitution is
'$(' compound_list ')'.
(Similar to how a subshell command is
'(' compound_list ')' ).
This is consistent with the POSIX grammar. The difference, as you say, is
that a command substitution is allowed as part of a word, so the closing
brace isn't a reserved word according to the strict definition.
Chet
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU chet@case.edu http://tiswww.cwru.edu/~chet/
- Re: nofork command substitution, (continued)
Re: nofork command substitution, Chet Ramey, 2023/05/19
Re: nofork command substitution, Grisha Levit, 2023/05/19
Re: nofork command substitution, Koichi Murase, 2023/05/23
- Re: nofork command substitution, Chet Ramey, 2023/05/24
- Re: nofork command substitution, Robert Elz, 2023/05/25
- Re: nofork command substitution, Koichi Murase, 2023/05/25
- Re: nofork command substitution,
Chet Ramey <=
- Re: nofork command substitution, Robert Elz, 2023/05/25
- Re: nofork command substitution, Chet Ramey, 2023/05/25
Re: nofork command substitution, Grisha Levit, 2023/05/23
Re: nofork command substitution, Daniel Douglas, 2023/05/25
Fwd: Re: nofork command substitution, Chet Ramey, 2023/05/19