Go through far files in a directory and unrar them.

unrar.sh

# Go through all files with extension .rar.
# create a folder with DIR_FileName
# Unrar each rar file and keep them in the respective directory
# install unrar using "brew" on mac 
#
for filename in *.rar;
        do echo "put ${filename}";
        mkdir RAR_${filename}
        unrar ${filename} RAR_${filename}
done