What is the command to find the following in unix: 1. List all files that start with y and end in z 2. copy all files that end in a followed by 'mydoc.pdf' to a PDF directory 3. delete all files that start with a single uppercase letter 4. find value of path variable for your default shell 5. which files does the shell examine for completions to the second word on command line 6. how would you arrange alias so that when you type xterm you get an xterm window with a red cursor