There are so many commands that a
comprehensive book about them would be the size of an encyclopedia. This
chapter hasn't even covered a tenth of the subject, yet you can do much
with what you learned here. If you wish, you may read some
manual
pages: sort(1), sed(1) and zip(1L) (yes, you are right: you can extract or make
.zip
archives with GNU/Linux), convert(1), and so on. The best way to get accustomed to these
tools is to practice and experiment with them, and you will probably find
a lot of uses for them, even quite unexpected ones. Have fun!