???LATER: add explanation of output for 2.1

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UTERMINAL

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 $V1$

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BOX

                         COMMAND                       

GO

 diff

 SYNTAX

          diff  [-ebh]  file1  file2

 FUNCTION

          diff compares two text files and indicates 

          what lines must be changed to make

          them the same.

 SOME OPTIONS:

       -b  -  causes trailing blanks and spaces to be ignored

       -e  -  produces output suitable for the ed editor

       -h  -  produces a fast, half-hearted job

 Let us use the diff command on the two files above.

        file1                       file2

    nl reads lines from         nl reads lines from

    the named file or           the named file or

    standard input if           11     standard input if

    no file is named,           no file is named,

    and reproduces the          21     and reproduces the

    lines with numbers          lines with numbers

    on the standard             on the standard

    output.                     output.

 Please enter the diff command to see the

 lines that are different in the two files above:

 Enter here:   

 That is correct!

 You've got it on the 2nd try.

 Good, you understand the concept.

 Please type diff to compare file1 and file2

 Please type diff file1 file2

 I guess I must type this for you:

FORGET1

 diff file1 file2

 Observe the result above.

     3c3

     < or standard input if

     ---

     > 11     or standard input if

     5c5

     < and reproduces the

     ---

     > 21     and reproduces the