Comment by l0b0

  ls | grep '.csv$' | xargs cat | grep 'cake' | cut -d, -f2,3 > cakes.csv

That's quite a few antipatterns in one go. Unless you have a bajillion files the `xargs` is unnecessary, the `cat` and `ls` are unnecessary (and `ls` in shell scripts is a whole class of antipatterns by itself). You might want to use something like this instead:

  grep cake *.csv | cut -d, -f2,3 > cakes.csv