This is a list of useful scripts on the CSCI1210.com server. The scripts are located in /home/jack/scripts. I usually cd to that directory and run the scripts from there (too lazy to add a global scripts directory and add it to $PATH). The usage examples all show their scripts being run from that directory
You could run them by specifying the path from any directory, i.e., /home/jack/scripts/ufwcheck.sh. In that case, there's no need for the './' prepending the script name