Write down the Unix commands to install software, remove software, unused packages, remove software and dependencies, remove downloaded achieves files in Linux

Create a file using nano editor and save it. The name of the file can be pmu.txt. Next, execute the Unix command ls -l pmu.txt in your ubuntu terminal and include the meaning for all the parameters of the Unix command output? 

Execute the Unix command ls -l in your ubuntu terminal and include the meaning for all the parameters of the Unix command output?