Let's get a local copy of this file and give it a name, by running the following commands:
wget http://www.inf.ed.ac.uk/teaching/courses/inf1-cg/labs/lab4/nouns.txt NOUNS=nouns.txt
Now when you type in the following (including the '$'):
cat $NOUNS
you should get the same list of animals as before.
Now type in the following command in your terminal window:
alias plural='sed "s/$/ z/g"'
Now when you type in the following:
plural $NOUNS
You should get the same list as before, where the plural suffix 'z' has been added to each noun in the file.