From: Andrej Borsenkow <borsenkow.msk@sni.de>
To: Zsh workers mailing list <zsh-workers@math.gatech.edu>
Subject: Order of field splitting in zsh
Date: Thu, 16 Jan 1997 17:07:29 +0300 (MSK) [thread overview]
Message-ID: <Pine.SV4.3.95.970116164954.21461M-100000@itsrm1.mow.sni.de> (raw)
POSIX.2 defines the following order of expansions in sh:
1. tilde expansion, parameter expansion, command substitution, arithmetic
expansion
2. field splitting (_after_ the above)
3. pathname expansion (globbing)
4. qoute removal.
It seems, that zsh (even if invoked as sh) does field splitting on result
of command substitution _immidiately_ after getting the value. The
example is:
% sh #where sh is linked to zsh
% args a$(echo a b)b${IFS::=:}
3
aa
bb
%
(the third being null string). If I understand POSIX specs right, it
should give _two_ arguments ('aa bb' and empty).
This example is obviously artificial; I fail currently to state if it can
be a problem in real life or not. (Note, that ${var::=val} is illegal in
POSIX; I use it to just demonstrate order of substitutions).
greetings
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Andrej Borsenkow Fax: +7 (095) 252 01 05
SNI ITS Moscow Tel: +7 (095) 252 13 88
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next reply other threads:[~1997-01-16 13:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
1997-01-16 14:07 Andrej Borsenkow [this message]
1997-01-16 15:55 ` Zoltan Hidvegi
1997-01-22 15:58 ` Andrej Borsenkow
1997-01-22 21:59 ` Zoltan Hidvegi
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