"Thomas' book is a little short on the 'grep' syntax details,
though, so I sought out another reference source--the man page.
'Man' is short for manual, and virtually every command and app in
Linux has a man page. Simply open the Ubuntu Linux Terminal app,
and type 'man
"Entering 'man grep' opens up the man page for the 'grep'
command, along with tons of details about the syntax and proper
usage of the command, as well as the diverse array of switches and
filters that can be applied to the 'grep' command to customize the