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From: "Nrusinh Ambekar" <nrusinh AT hotmail DOT com>
To: cygwin AT cygwin DOT com
Subject: Re: problem - if statement in shell script gives opposite results with new bash
Date: Wed, 02 Oct 2002 15:18:27 +0000
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Message-ID: <F89GUzLhG4YalgQkdzg0001103d@hotmail.com>
X-OriginalArrivalTime: 02 Oct 2002 15:18:28.0167 (UTC) FILETIME=[F59AF570:01C26A26]

Hi Igor,

Thanks very much for your help. After this change, its working fine.

Regards,
Nrusinh


>From: Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
>Reply-To: cygwin AT cygwin DOT com
>To: Nrusinh Ambekar <nrusinh AT hotmail DOT com>
>CC: cygwin AT cygwin DOT com
>Subject: Re: problem - if statement in shell  script gives opposite results 
>with new bash
>Date: Wed, 2 Oct 2002 10:18:01 -0400 (EDT)
>
>Nrusinh,
>
>On Wed, 2 Oct 2002, Nrusinh Ambekar wrote:
>
> > Hi,
> > I have recently downloaded new cygwin. I am getting incorrect results 
>when I
> > run simple shell script using bash. The same shell script runs fine with 
>old
> > cygwin bash.
> >
> > Your help is really appreciated.
> > thanks,
> > Nrusinh
>
>A quick correction: it's not the if statement that gives the opposite
>results, it's the "test" command (the "[...]" construct) that returns an
>"opposite" value.  This having been said, there are a couple of problems
>with your script (see below):
>
> > The script is as follows
> >
> > #!/usr/local/bin/bash
>     ^
>Why is your bash in /usr/local/bin?  It's normally installed in /bin (or
>/usr/bin, which is usually the same under Cygwin).
>
> > myfunc()
> > {
> > local item=$1
> > shift 1
> > local list=" $* "
> > echo "item is"
> > echo $item
> > echo "list is"
> > echo $list
> > if [ "${item}" = "${list}" ] || [ "${list#"* ${item} *"}" != "${list}" ] 
>|| [ "${list#"${item} "}" != "${list}" ] || [ "${list%" ${item}"}" != 
>"${list}" ]
>   ^
>Your quoting seems off here.  Quotes do not nest in bash (or any other
>shells)...  Besides, if you're using the curlies ("{}") to delimit
>variable substitutions, you don't need to quote stuff inside the curlies.
>
>Also, your prefix/suffix matches don't seem well-constructed.  The first
>one, frankly, doesn't make sense at all - bash cannot match regular
>expressions open at both ends.  You're better off with something like
>this (which works, btw):
>
>if [ "${item}" = "${list}" ] || [ "${list#* ${item} }" != "${list}" ] || [ 
>"${list% ${item} *}" != "${list}" ]
>
> > then
> > echo "found"
> > else
> > echo "not found"
> > fi
> > }
> >
> > myfunc CECA OTA OEA CECA
>
>So, this is not a bash bug after all.  I'm really not sure why the script
>used to work...  You probably relied on some bug that was fixed in the
>current version.  And, unless you had a link from /usr/local/bin/bash to
>/usr/bin/bash (or ran this explicitly with "bash script.bash"), this
>wouldn't have worked at all.
>	Igor
>--
>				http://cs.nyu.edu/~pechtcha/
>       |\      _,,,---,,_		pechtcha AT cs DOT nyu DOT edu
>ZZZzz /,`.-'`'    -.  ;-;;,_		igor AT watson DOT ibm DOT com
>      |,4-  ) )-,_. ,\ (  `'-'		Igor Pechtchanski
>     '---''(_/--'  `-'\_) fL	a.k.a JaguaR-R-R-r-r-r-.-.-.  Meow!
>
>"Water molecules expand as they grow warmer" (C) Popular Science, Oct'02, 
>p.51
>
>
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