<caption><image_63>The image is a screenshot of a computer screen with a blue background. On the screen, there are several code snippets written in white text. The code snippets are arranged in a grid-like pattern. 

The first code snippet reads "O echo "Enter pattern to find" and the second code snippet says "read pattern". The third code snippet is "1 echo "Too many arguments - only one allowed" and it says "exit". The fourth code snippet has "scrap "Spoutterm" "Sphenefile II" and "echo" pattern not found in the list".

At the bottom of the image, there is a note that reads "case $4 in".</caption> the variable name and now when I echo out what's in that variable you see that it's stored exactly what I entered on the keyboard I can use this if the user doesn't enter any arguments instead of printing out a usage message I can tell the user to enter the pattern with an echo statement and then read their pattern off the command line and then search for that pattern in the phone file this requires that we change the program around a little bit but basically it works this way either the user will supply a pattern or all prompt for a pattern in either case I want to run grep with that pattern to search through the phone list this means I have to change the case statement a little bit because now the purpose of the case statement is to select the pattern that grep will use in this case statement if there are no arguments on the command
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