Renamin 1000s of files

Hi,

I have over 7000 jpgs in a folder called 'imgs'. they are all named something like:

2399 (Custom).jpg
1948 (Custom).jpg
1919 (Custom).jpg

i want to be able to rename all the images in teh whole folder at once from that to something like:

2399_t.jpg
1948_t.jpg

all the images have 4 digits and then the ' (Custom).jpg'

Thanks,
comp

! backup them before trying this !

1. where do I run that command?

2. should it be

1. in the command shell (yes, windows has that too). Start-run-"cmd". use the usual "c:" and "cd \documents\www" before you type the line.
2. the quotes are only necessary if you have spaces in the file names but it would do the exact same function.

works well, only took a few seconds to do all the files.