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From: dexen deVries <dexen.devries@gmail.com>
Date: Thu, 26 Apr 2018 17:20:08 +0200
Message-ID: <CAJUT6o45+kfag-bNtY9yGhRd-aLQM5fEzR7y3KY6RuZRGicBPQ@mail.gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] simple rc problem in p9p (on OpenBSD)
Topicbox-Message-UUID: d4b3e870-ead9-11e9-9d60-3106f5b1d025

use a list. lists are created either by the parentheses:

% w = ( A B C )
% # note no space before the backslash
% wMultiline = (\
X\
Y\
Z\
)
% echo $w $wMultiline
A B C X Y Z
% for(i in $w) {echo $i; echo XXX}
A
XXX
B
XXX
C
XXX

or by globbing:
% text_files = *.txt

or by expanding a whitespaced text:
% text_files = `{ 9 ls *.txt }

note the p9p's "ls" quotes whitespace in file names properly for Rc

lists are single-level; merging two lists produces new one of single
level, with all the elements in order
% a = ( foo bar )
% b = ( aa $a bb )
% echo $a
foo bar
% echo $b
aa foo bar bb

side note, the ^ operator has interesting uses for lists:

% a = ( foo bar baz)
% b = ( aa bb cc )
% flat = ( first $a last )
% echo $a
foo bar baz
% echo $flat
first foo bar baz last
% car = $a ^ $b
% echo prefix ^ $a
prefixfoo prefixbar prefixbaz
% echo $car
fooaa barbb bazcc