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In the past , every time we have figured out a new way to probe the Universe we have discovered something new and unexpected : from Galileo first turning his telescope to the sky and discovering moons around Jupiter to the launch of satellites that can see gamma-rays discovering unfathomable explosions in the Universe named gamma-ray bursters . Creates the directory named by this abstract pathname , including any necessary but nonexistent parent directories . Marks the file or directory named by this abstract pathname so that only read operations are allowed . Please mount these in the correct places on your paper with a gluestick , and write the figure name ( lightly ) on the back of each image in case it becomes detached . For each source_file , cp copies the contents of the file to a destination file in the existing directory named by target_dir . What about that two hour and seven minute movie by a director named Mel Gibson ? At this point , it is possible to take advantage of all these elements to correlate the user name with the computer name .