1. Write this script inside any file for e.g. Sky [file extension doesn't matter] and make this file as executable file

current_date_time="`date "+%Y-%m-%d%H:%M:%S"`";
cd /home/akashgudadhe/FunZone/
mysqldump -u [user_name] -p[password] [dbname] > `pwd`/"$current_date_time.sql"

2. Run using terminal

./Sky [<----any_of your file name that you preferred above]

It will save [newly_created_file] into specified directory automatically.