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Conditional expression problem: both "-a file" and "! -a file" return tr


From: re2823
Subject: Conditional expression problem: both "-a file" and "! -a file" return true
Date: Fri, 6 Jan 2006 22:02:38 +0000

Hi.

Excuse me if I've got things somewhat confused here (I'm a complete Unix
newbie), but I've found what I think is a bug.

If I create a file using:

address@hidden:~$ touch testFile

and then run the following two lines, I get conflicting results:

address@hidden:~$ [ -a testFile ]  && echo true || echo false
true

address@hidden:~$ [ ! -a testFile ]  && echo true || echo false
true

Like I said, I'm only a Unix newbie, so I'm really unsure whether this is a
problem, or whether it's expected behaviour, but in my searching for
information, I found:

http://www.faqs.org/faqs/unix-faq/shell/bash/

and point E1 ("Why is the bash builtin `test' slightly different from
/bin/test?") seems to indicate that the two results should be the "opposite"
of each other.

By the way, here's some information created by running bashbug on my machine:

Machine: i486
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i486'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i486-pc-linux-gnu'
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash'
-DSHELL -DHAVE_CONFIG_H  -I.  -I../bash -I../bash/include -I../bash/lib
-g -O2
uname output: Linux machine 2.6.12-10-686 #1 Thu Dec 22 11:55:07 UTC 2005
i686 GNU/Linux
Machine Type: i486-pc-linux-gnu

Bash Version: 3.0
Patch Level: 16
Release Status: release


Anyway, I'd really appreciate any comment from anyone who can shed light on 
this...

Thank you,

Dave




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