It's better to make those scripts executable with chmod +x [ SCRIPT ] and then execute them like that:
./[ SCRIPT ]
Alternatively, you may use:
bash [ SCRIPT ]
Here are additional instructions for specific scripts:
sudo su
./proc_ddos
./file_cleaner [ FILE_1 ] [ FILE_2 ] [ FILE_n ]
Alternatively, you can pass wildcards:
./file_cleaner *.jpg
You may need the following command if it's your first clone of the project:
git clone git@github.com:d3fenderz/bash-scripts.git && cd bash-scripts
git submodule update --init --recursive
Otherwise, you may download each script one by one.