Split contents of a directory into multiple sub directories

the following worked well for me. Open the directory in terminal, and just copy & paste the following script, press enter. sub directories will be created inside having names dir_001, dir_002 and so on.

i=0; 
for f in *; 
do 
    d=dir_$(printf %03d $((i/100+1))); 
    mkdir -p $d; 
    mv "$f" $d; 
    let i++; 
done