[Gllug] Bash quote woes!

Benjamin Donnachie benjamin at py-soft.co.uk
Tue Jan 27 16:41:16 UTC 2009


I'd be very very VERY grateful if someone could please help with the
following bash fragment:

[...]
function connecteddrives()
{
  connecteddrives=""

  # /proc/partitions is in format "major minor blocks device" and first two
  #  lines are junk.

  for drive in $( cat /proc/partitions | awk '{ if (NR > 2) print $4 }' )
  do
    local details=$( hdparm -I /dev/$drive 2>&1 )

    local model=$( echo "$details"  | grep "Model Number: "  )
    local serial=$( echo "$details" | grep "Serial Number: " )

    if [ "x" == "x$model" ] ; then
      model="Unable to get details."
      serial="USB or SCSI?"
    fi

    connecteddrives="$connecteddrives $drive \"$model\" OFF \"$serial\""

  done

}

connecteddrives

echo $connecteddrives

Xdialog --backtitle "Proof of concept Hard Drive erase program"
--title "HD Nuke" \
        --item-help --separate-output --checklist "Please select the
drives you wish to nuke\n \
\nThis program will attempt to use the on-board security erase command.  \
If not available, it will fall back to over-writing" 30 61 6 \
$connecteddrives

[...]

It should return a list of partitions in the following format for
display as a checklist using xdialog:

Drive "Model number" OFF "Serial number"

The echo statement confirms that the format is fine:

sda " Model Number: WDC WD2500AAJS-60VWA1 " OFF " Serial Number:
WD-WCARY0581557" sda1 " Model Number: WDC WD2500AAJS-60VWA1 " OFF "
Serial Number: WD-WCARY0581557" sda2 " Model Number: WDC
WD2500AAJS-60VWA1 " OFF " Serial Number: WD-WCARY0581557" sda5 " Model
Number: WDC WD2500AAJS-60VWA1 " OFF " Serial Number: WD-WCARY0581557"

But xdialog fails to display properly as per attached screen shot.  If
I cut and paste the above in then it works fine.

Clearly quotes are being misinterpreted somewhere along the line.
I've tried all-sorts including including trying to use the output from
`echo $connecteddrives` but that still fails....

It's no doubt going to be something simple, but it's driving me nuts....

Ben
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