Troubles with my bash script

[vwyodapink]

Hey all and happy holidays, I am just starting to mess more with writing my own bash scripts and I have run into a situation I can not seem to work around as I do not think I am going about things properly. What I want to achieve is the following:
1. check if a file exists in a folder
2. if it does not exist then wget the package
3. if it does exist then wget -N to see if the version in the folder is older than the one online
4. if it is newer then download the new version

I know there has to be better ways of going about what I am trying to do and I am open to any suggestions and or info

what I would also like to have it do is instead of me checking for a specific program version in the folder, have it get what version number is in the folder if its in there then check to see if there is something newer. If you need any more info or anything please let me know. Thanks a ton

*I had to put hxxp since I cant post links yet

#!/bin/bash
#
# Script to check for newer version of files that I will keep on hand for the Fed and Build installs Only 
#
# Variables
USERNAME=vdubhack
FOLDER=/home/$USERNAME/other/programs/
#
if [ ! -f "$FOLDER/cudatoolkit_3.2.16_linux_64_fedora13.run" ]; then
            cd $FOLDER
            wget hxxp://developer.download.nvidia.com/compute/cuda/3_2_prod/toolkit/cudatoolkit_3.2.16_linux_64_fedora13.run
            echo "Cudatoolkit did not exsist downloading"
    elif [ == -f "$FOLDER/cudatoolkit_3.2.16_linux_64_fedora13.run" ]; then
             wget -N hxxp://developer.download.nvidia.com/compute/cuda/3_2_prod/toolkit/cudatoolkit_3.2.16_linux_64_fedora13.run
             echo "there was something newer only"

    else
              echo "nothing to do file was there and nothing newer online."

fi

[dufftime]

I think you can just use some combination of no clobber and newer (-rN maybe?) and turn this into a one-liner.

Sorry don't have a Linux shell to test with, but maybe just:

$ wget -Nr hxxp://developer.download.nvidia.com/compute/cuda/3_2_prod/toolkit/cudatoolkit_3.2.16_linux_64_fedora13.run

In the future, if you find your script doing this:

if [ case ]; then
  code1
elif [ ! case ]; then
  code2
else
  # noop
fi

Then it should be:

if [ case ]; then
  code1
else
  code2
fi