Shell Programming and Scripting

echo $variable |  tr -d '[A-Za-z]' | read numStr

echo "lvol4" |  tr -d '[A-Za-z]' | read numStr
echo $numStr

echo "rlvol11" | tr -d '[:alpha:]'

$ v="rlvol11";echo "${v//[!0-9]}"
11

for x in *
    do
        if [ "echo $x" = "lvol*" ]; then
    echo $x |  tr -d '[A-Za-z]' | read lvolnum
    echo /dev/$1/lvol$lvolnum
    lvdisplay lvol${lvolnum} | grep Mbytes
        fi
done

for x in *
do
      if [ "$x" = lvol* ]; then
        echo $x |  tr -d '[A-Za-z]' | read lvolnum
        echo /dev/$1/lvol${lvolnum} --> Where did you get $1 from ?
        lvdisplay lvol${lvolnum} | grep Mbytes
      fi
done

for x in lvol*
do
  echo /dev/$1/$x
  lvdisplay $x | grep MBytes
done