I need help with these questions for my homework. This is all UNIX/Linux stuff.

1. Identify the three parts of the UNIX command ls -l /usr/bin

2. The shell scans each command you type several times before execution. What symbols can you use to prevent the shell from scanning certain parts?

3. What command shows you the PIDs of your current processes?

4. Identify redirection symbols used in UNIX commands dor specifying what to do with input and output.

5. This command shows you a periodically updated list of which processes are using the most system resources. It uses lots of resources itself.