Hello.
Sorry for being here again, rather bash unrelated mostly..
Steffen Nurpmeso wrote in
<20240816215210.PMy3rwiy@steffen%sdaoden.eu>:
|Steffen Nurpmeso wrote in
| <20240816212216.accse4FG@steffen%sdaoden.eu>:
||Robert Elz wrote in
|| <16443.1723841...@jacaranda.noi.kre.to>:
||| Date: Thu, 15 Aug 2024 23:33:42 +0200
||| From: Steffen Nurpmeso <stef...@sdaoden.eu>
||| Message-ID: <20240815213342.t6-hdjZT@steffen%sdaoden.eu>
|||
|||| I have extended the test a bit, and i also see word split
|||| differences.
|||
|||There are so many problems with this test, that I'm not sure
|||it is worth bothering looking to see what happens, or why there
|||are differences.
||
||Might very well be it is true what you say for IFS, i should place
||a semicolon after its' assignment.
In the meantime it turns out dash has another problem with
IFS="\011" which i falsely tried because some shells do not
support IFS=$'\t' yet. (Ie, that is de-facto [\01] it seems.)
But that aside.
I have myself a failure and i do not understand what i do wrong,
maybe someone could give me a hint on that, that would be nice.
If i have
a() { echo $#,1=$1,2=$2,"$*",$*,; }
set -- a b c
echo 2
IFS=:; echo "$*"$*; a $* "$*";
then bash gives me
2
a:b:ca b c
4,1=a,2=b,a:b:c:a:b:c,a b c a b c,
whereas my little mailer says
2
a:b:ca b c
2,1=a b c,2=a:b:c,a b c:a:b:c,a b c a b c,
What i do not understand is the difference in between the $*
expansion in the call to "a".
Why does bash (aka sh(1)) word splits
IFS=:; echo "$*"$*; a $* "$*";
^
this
unquoted $* at SPACE into three different tokens?
And space is not in $IFS when the call to "a" is prepared.
Ie if "$*" is expanded to "a b c" (which it likely is), and then
"a b c" is word-splitted via $IFS, then, since $IFS is only colon,
"a b c" cannot be splitted at all?
All shells i have tried do it like that, but i cannot find any
words in POSIX 2.6.5 word splitting etc that make me wrap my head
around this behaviour.
--steffen
|
|Der Kragenbaer, The moon bear,
|der holt sich munter he cheerfully and one by one
|einen nach dem anderen runter wa.ks himself off
|(By Robert Gernhardt)
