Questions: Give a valid UNIX command line to achieve each of the following: 1) Change to another directory called CS421 2) Delete a file called uselessfile 3) Rename proglc to prog2.c 4) List the contents of the current directory including all file details 5) Print your current working directory 6) Make a new directory called newdir 7) Display the contents of a file called oldfile For the editor you chose to use, what command/action do you use to: 8) Add a new line of code 9) Search for a string 10) Save the file