Create sample files lab1, lab2, lab3 and lab4. They can be created using vi, or doing something like who > lab1, etc. Once you have created the file, display its content with the cat command. Show your session. Combine the lab files: lab1, lab2, lab3, and lab4 appending them >> to a file called all.labs . Any errors (pretend one of those lab files do not exist) should be redirected to an error.log file. Since you will have all the files, once you redirect the error 2>, assume that you do not have one of the files that consequently would generate an error, in this case the error.log file will be empty, but to build the command include the 2> as if one of the files did not exist. This whole command will be in one line. Show your session.