From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Environment variable
Date: Wed, 9 Aug 2006 21:09:20 -0500 [thread overview]
Message-ID: <da52034f65a1c5d41ef61abcd67ac43d@quanstro.net> (raw)
In-Reply-To: <02E129D3-32DF-41CC-9026-46BAA1FF8133@ar.aichi-u.ac.jp>
the "problem" is backquoting. you can see this clearly by distilling
your example:
; a = ''
; b = `{cat /env/a}
; whatis b
b: not found
; ls -l /env/^(a b)
--rw-rw-rw- e 0 quanstro quanstro 1 Jul 6 19:33 /env/a
--rw-rw-rw- e 0 quanstro quanstro 0 Jul 6 19:33 /env/b
since backquoting always treats '\0' as an ifs character
; x = `{echo -n ''}
is the same as
; x = ()
that is,
; ls -l /env/x
--rw-rw-rw- e 0 quanstro quanstro 0 Jul 6 19:33 /env/x
the only asymmetric thing to me is the fact that
; x = ()
sets /env/x, yet $x throws an error. (byron's rc does the opposite.)
- erik
On Wed Aug 9 05:01:18 CDT 2006, arisawa@ar.aichi-u.ac.jp wrote:
>
> term% b=`{cat /env/a}
> term% xd -c /env/b
> 0000000
> 0000000
> term% b=`{echo $a}
> term% xd -c /env/b
> 0000000
> 0000000
> term% b=`{echo ''} # echo null string
> term% xd -c /env/b
> 0000000
> 0000000
> term%
>
> ??? /env/b is empty ! not same as /env/a
prev parent reply other threads:[~2006-08-10 2:09 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-04 9:37 [9fans] vmware? Anssi Porttikivi
2006-08-04 9:47 ` Lluís Batlle i Rossell
2006-08-04 15:15 ` Richard Bilson
2006-08-04 15:44 ` erik quanstrom
2006-08-07 22:14 ` Richard Bilson
2006-08-07 23:50 ` Federico Benavento
2006-08-04 19:03 ` Gorka guardiola
2006-08-09 10:00 ` [9fans] Environment variable arisawa
2006-08-09 11:03 ` Martin Neubauer
2006-08-09 11:16 ` arisawa
2006-08-09 11:27 ` Martin Neubauer
2006-08-09 11:36 ` arisawa
2006-08-09 11:39 ` Martin Neubauer
2006-08-09 12:04 ` arisawa
2006-08-09 12:26 ` Martin Neubauer
2006-08-09 12:39 ` Martin Neubauer
2006-08-09 12:58 ` arisawa
2006-08-09 13:22 ` arisawa
2006-08-09 13:30 ` Martin Neubauer
2006-08-10 2:15 ` erik quanstrom
2006-08-09 12:03 ` [9fans] editor, man/less, dns setup, screen setup bituman
2006-08-09 12:08 ` Martin Neubauer
2006-08-09 12:08 ` Robert Raschke
2006-08-19 0:45 ` Rodolfo (kix)
2006-08-10 2:09 ` erik quanstrom [this message]
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