NCBI GI to Gene Description

Hello all,

I have a very large list of NCBI gene IDs (such as, gi:47221249, ect). I am hoping to use this list to get the descriptions for each of the gene IDs. Using the GI above it would be "unnamed protein product [Tetraodon nigroviridis]".

Thus ending up with a file that has two columns, one with gene IDs and the other with the description for these IDs.

Would anyone know of a script/software already available to do a job such as this?

Thanks for the help!