Write down a Unix command that will list all processes running on the computer then display information aboutonly the processes with ”browser” in their descriptions.

find The find command takes a pattern as a command-line argument and recur- sively searches through directories to find a filename matching that pattern. It should print a relative path starting with "./" for every file/directory that matches. For example, running ./find 1s.c from within the hw2 directory should print ./1s.c. If run from the parent directory, the output would be . /hw2/1s.c. There may be multiple matches. If we run ./find .c from within the hw2 directory, we should see: ./find.c ./1s.c ./tree.c The output does not need to be sorted. If nothing matches, it shouldn't print anything. Pattern matching should be case sensitive.

Write a shell script that reads a directory name and displays all the files in this directory if it is a valid directory; otherwise keeps displaying a message like "Enter a valid directory" until the user enters a valid directory. Hints: you can use a while loop.

Write a shell script that allows users to choose and execute the respective Linux commands. The following are the command options that the users can select based on the respective alphabets: A: Display current user. B: Display current date. C: Display help page of a Linux command. D: Add new user to the system. E: Switch to another user. If the user selects any other choices from above, prompt the user to select again, only from A to E