Linux Command Line Screening questions What is a shell? Replace all instances of foo with bar in a file. Resources https://en.wikipedia.org/wiki/Pipeline_(Unix) http://www.cs.toronto.edu/~maclean/csc209/unixtools.html http://fishshell.com/ http://gnometerminator.blogspot.com/p/introduction.html https://csvkit.readthedocs.io/en/0.9.1/