Processing file by file in a txt, and storing the name of the file being processed

[Alphabeta]

Hi!,
I'm kinda new to shell scripting, Here's a problem that I have faced and dunno how to solve:
First,
I want my script to rename the files stored in a .txt file line by line(there's no pattern that I can use with mv, so I want mv to deal with a file generated by ls /home/whatever/ > whatever_files.txt). So, Let's that that now mv is dealing with the first line in whatever_files.txt which has a file name /home/whatever/whatever545.jpg, I want the new file to be called file_whatever.jpg. But in order to do that, I figured out that I must store the name of the file in a variable and having a mv command which looks like this:
mv whateverhey.jpg file_$filename

but I dunno how to store that name in a variable and how to make mv deal with files listed in a text file.

Thanks!

[Alphabeta]

I figured out that I can a non C-style loop to work with all the files in directory but when I write this it doesn't work:
for filename in *
do
mv $filename hello_$filename
done

????

Thanks

[jim mcnamara]

cd /to/my/directory
find .  -name '*.jpg' | \
while read file
do
    mv $file "new"$file
done

PS: mv works only within a filesystem. Even though you may be
in directories that are close in terms of directory trees does not mean there are no intervening mountpoints. -

[Alphabeta]

I indeed sometimes try to access some directories behind mount points(for example, hdb1 mounted on /home/user/myfolder), while the script is being executed from the user home directory, Do you mean that this can result in some problems?

Thanks!

[jim mcnamara]

In that case you have to use cp. mv does not mv over mount points.