If, then, else or loop? help

[ncsuapex]

I have a script that changes all file extensions from .jpg to .JPG. I have written the script to go from .JPG to .jpg as well. What I need help with is. How would I edit the script to do either convert them from .jpg to .JPG or .JPG to .jpg


My current script is:


#!/bin/bash
# I just run the script and make sure I put a # at the start of the line I don't # need.


for i in *.jpg; do j=`basename "$i" .jpg`; mv -v "$i" "$j.JPG"; done

for i in *.JPG; do j=`basename "$i" .JPG`; mv -v "$i" "$j.jpg"; done


How would I make it check for jpg and change it to JPG, if there are no jpg, then it needs to check for JPG and then convert them to jpg.

Thanks

[ph34r]

add an argument to how you call the script

if $1 is null, exit and explain the arg it expects

if $1 == upper then
do the upper case version
else if $1 == lower
do the lower case version
else
complain about an arg being there, but not being upper or lower

[ncsuapex]

I just created 2 seperate scripts, one to make it lower case to upper, one to make it upper to lower. Thanks.