Problem
1. How are these two commands similar and different? sort -u foo ; uniq foo.
2. A feature provided in a user's startup file appends the output of the date command to a file foo whenever a user logs in. How can the user print a report showing the day along with the number of times she logged in on that day?
3. Devise a pipeline sequence to display a count of the processes on your system in the form count process_name.