Try out some commands on your own Write down the commands you used. In each of
these, you should be able to write a single command to generate the desired
output.  You might need to "pipe" several programs together.

Submit your commands and commentary on Gradescope as a PDF.  Your PDF should
contain both the command you wrote as well as the output.

You can still receive points for these exercises even if you don't fully
get things working.  Add some commentary to your PDF explaining how far you 
got, what is not working correctly, and what you would need to do to complete
the task.  The more detail you provide here, the higher the partial credit.

If you rely on any outside sources (e.g., Stack Overflow) be sure to cite these 
sources in your answer for the relevant task.  Outside sources are **allowed**
for this assignment, so long as that outside source does not completely solve
the task.


(1) (one command)

    Output to the screen the names of all files in the random/ filesystem
    that contain (inside them, not in their names) the string "190".

(2) (one command)

    Make a text file called "unique-first-column-values" such that each
    line in it corresponds to a value that occurs in the first column
    position in one of the files in random/.
   
    For example, if the only file in random looked like this:

    89,38,58,91,27,35,2,86,9
    97,21,17,95,90,18,58,30,192
    63,0,32,9,76,26,70,8,7
    29,85,2,45,47,44,18,50,82
    94,25,74,36,23,2,82,91,40
    90,40,33,19,18,26,52,77,19
    20,53,46,80,59,22,20,7,116
    65,19,29,60,8,70,10,46,103
    97,89,99,18,54,1,51,9,68
    28,12,88,33,34,28,74,10,126
    4,45,67,48,5,29,72,26,143
    87,36,48,40,60,13,55,12,185
    3,60,78,96,46,12,22,40,161

    The output might be
    3
    4
    20
    28
    29
    63
    65
    87
    79
    90
    94
    97

    (note 97 only appears once)

(3) (one command)

    How many files in the random/ filesystem contain the string "54,1" ?

(4) (one command)

    How many characters (bytes) total are taken up by files in the random/
    filesystem that have an extension between .30 and .39 (i.e.,
     \\.3[0-9] ) and that also contain the substring 51,4 ?

(5) (one command)

    Make a file called "big-1,2,3" that contains all text lines
    containing the substring "1,2,3" inside all files in the random/
    filesystem.

    Hint: this line will appear in big-1,2,3:
    39,11,4,22,31,71,2,36,170
    ... it originally comes from random/ca0255e/2436c0e6.8d .