I have a file from Chip-Seq data. I want to use this information to look for the GC content of promoters.

Which software I can use?

Thanks  
Ankur
The simplest would be to use nuc option in bedtools.

    bedtools nuc -fi $ref-fasta-file -bed $promoterbedfile > $outputfile

Similar questions have been answered before -

 - https://www.biostars.org/p/47047/
 - https://www.biostars.org/p/70167/