Multiple choice technology testing How do you print the first 15 lines of all files ending by ".txt" in UNIX? print 15 .txt cat *.txt -length=15 head -15 *.txt tail -15 *.txt Reveal answer Fill a bubble to check yourself C Correct answer Explanation The head command displays the first lines of a file. head -15 *.txt shows the first 15 lines of all files ending in .txt. tail shows the END of files, and the other options are not valid UNIX commands.