These passwords are stronger than one might expect. There are 40 billion 267 million 857 thousand 960 different ways to select four words from the list.
A random number between 0..999 is added at the end, increasing the search complexity by several orders of magnitude
genpassphrase() { echo $(curl -fSsL https://raw.githubusercontent.com/rohan-molloy/generate-hostnames/master/words.txt | shuf -n4 | tr '\n' '-')$(($RANDOM%999)); };