[Chester LUG] Help with a bash script

[Roger Gibson]

Takes me back to my Unix days, when I concocted all sorts of weird 
things like this to automate the integrated processing of data coming 
unreliably from a wide range of plant sensors, and feeding back to fine 
tune the process. (If you have a reasonable recent reading use it, but 
if not, ignore for now, or look back to a previous similar situation 
....)  Must come to meeting, but alas not next Thursday, unless quite 
late, but I have a 6.00am flight out of Liverpool Friday morning.  Roger.

On 18/10/2010 21:49, Stuart Burns wrote:
> Dave, you must be a bash Jedi!
>
> It does work, and I can kind of trace how it works, but would you mind 
> explaining it a bit more ?
>
> Cheers muchly. I owe you a beer, if your at the LUG next week ?
>
>
> On 18 October 2010 21:26, David Holden <dh at iucr.org 
> <mailto:dh at iucr.org>> wrote:
>
>     Hi Stuart,
>
>      VERY quick hack but it may work, the grep allows # comments
>
>
>     IFS=' ';
>
>     datfile="1.dat"
>
>     (
>     cat $datfile | sort | grep -v \# | while read data
>     do
>      data_array=(`echo "$data"`)
>      col1=${data_array[0]}
>      echo -n "$col1 "
>      cat $datfile  | sort  | grep "$col1" | awk '{print $2}' | tr '\n' ' '
>      echo ""
>     done
>     ) | sort | uniq
>
>
>     Dave.
>
>
>     On 18/10/10 17:44, Stuart Burns wrote:
>     > Hi everyone,
>     >
>     > I am hoping someone can help me a bit here. I am creating a
>     cript that
>     > deals with volume groups. However my bash skills fall short.
>     >
>     > I have a file that looks like this
>     >
>     > Vg955-01 /dev/diska1
>     > Vg955-01 /dev/diska2
>     > Vg978-01 /dev/disk45
>     > Vg978-04 /dev/disk13
>     >
>     > You get the picture.
>     >
>     > Now what I am trying to do is get all the vg parts followed by the
>     > constituent disks. Ie above should look like:
>     >
>     > Vg955-01 /dev/disk1a /dev/diska2
>     > Vg978-01 /dev/disk45
>     > Vg978-04 /dev/disk13
>     >
>     > I cant really think of an easy way to do it without resorting to
>     perl.
>     > Can anyone help?
>     >
>     > Regards
>     >
>     > Stu
>     >
>     > _______________________________________________
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>     >
>
>     --
>     Dr David Holden. (dh at iucr.org <mailto:dh at iucr.org>)
>
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>
>
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