Date: Fri, 12 Aug 2005 13:38:34 -0700 From: Benson Wong <tummytech@gmail.com> To: Ian Smith <smithi@nimnet.asn.au> Cc: Xu Qiang <Qiang.Xu@fujixerox.com>, freebsd-questions@freebsd.org Subject: Re: Help on bash script? Message-ID: <860807bf050812133839dd8f46@mail.gmail.com> In-Reply-To: <Pine.BSF.3.96.1050813044601.8009A-100000@gaia.nimnet.asn.au> References: <20050812013604.8C12D16A422@hub.freebsd.org> <Pine.BSF.3.96.1050813044601.8009A-100000@gaia.nimnet.asn.au>
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I prefer:
for COREFILE in `find / -type f -name core -print`
do
...
done
Wouldn't that accomplish the same thing?
On 8/12/05, Ian Smith <smithi@nimnet.asn.au> wrote:
> On Fri 12 Aug 2005 09:33:54 +0800 Xu Qiang <Qiang.Xu@fujixerox.com> wrote:
>
> > find / -type f -name core -print | while read COREFILE ; do
> > NCOREFILES=$[ $NCOREFILES + 1 ] # a bit strange - xq
> > echo $NCOREFILES # xq
> >
> > NEWNAME="${HOSTNAME}esscore${NCOREFILES}_${TIMESTAMP}"
> > # record mapping so people can go back and figure out
> > # where they came from
> > echo -e $NEWNAME " was " `ls -l $COREFILE` >> $SAVE_DIR/$CORELOG
> > mv $COREFILE $SAVE_DIR/$NEWNAME
> >
> > echo "There are $NCOREFILES core files." # xq
> > done
> >
> > fi
> >
> > # What confused me most is the value $NCOREFILES outside
> > # the do-while loop (but still in this function) reverted
> > # back to its initial value, which seems contradictory to
> > # our concept of local variables. - xq
> > #echo $NCOREFILES
>
> It's been pointed out that the find piped to while runs in a subshell,
> and that changes to variables within aren't seen by its parent, but one
> way around this is to avoid using a pipe, thus a subshell, for instance:
>
> find / -type f -name "*.core" -print >tempfile
> while read COREFILE; do
> [.. stuff ..]
> NCOREFILES=$(($NCOREFILES + 1))
> done <tempfile
> echo $NCOREFILES
>
> I use sh, not bash, but suspect that this should work in bash too.
>
> cheers, Ian
>
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