Script to format server list into ansible format.

Script to format list of servers into ansible format.
Example:
if you have a text file which has list of servers as below.

app.server.com
app2.server.com
web1.server.com
web2.server.com
[app]
app.server.com
app2.server.com
[web]
web1.server.com
web2.server.com

How to use it ?
create a file generateInventory.sh with the contents below and it the same directory create a file named raw_inventory.txt with list of the servers and run the script using ./generateInventory.sh and you will get ansible format Inventory file will generated.

# Script to format list of servers into ansible format.
file=raw_inventory.txt
 last=''
 while read nameX
 do label="${nameX%%[.0-9]*}"
    if [[ "$label" != "$last" ]]
    then echo "[$label]" # or printf "\n$label\n" for a separator line
         last="$label"
    fi
    echo "$nameX"
 done < $file > Inventory