need help solving these problems thanks.

Say you want to create a file called "helloworld.cpp" in your working directory, what is the exact Linux command you would use to accomplish this? Say you want to change the name of the file "helloworld.cpp" in your working directory to "hello.cpp", what is the exact Linux command you would use to accomplish this? Say you want to display the contents of "hello.cpp" in your terminal window, what is the exact Linux command you would use to accomplish this? Say you want to remove hello.cpp" from your current working directory, what is the exact Linux command you would use to accomplish this? Say you want to switch from your current directory back one directory, what is the exact Linux command you would use to accomplish this? Say your current working directory has a directory that is not empty (directory tree) called newDirectory in it and you want to delete it, what is the exact Linux command you would use to accomplish this