<caption><image_64>The image is a screenshot of a computer screen with the text "phfind.read" written in blue. The text is in a bold, sans-serif font and is centered on the screen. The background of the screen is a dark grey color. The image appears to be taken from a top-down perspective.</caption> line I print the prompt for the user to enter the pattern they'd like the system to search for I then read in the variable pattern if one argument is entered on the command line I store that argument in the variable pattern if more than one argument is listed on the command line I print out an error message and then exit the script with the explicit exit command if no arguments were entered or if one argument was entered the case statement terminates and I then search the file for the contents of the pattern variable if that's not found I then echo out the message that that pattern wasn't found I've stored this script on my system as pH find dot read let's take a look at it as you can see I define the variable phone file to be the system phone list I use the case command to identify the pattern to search and then I search for that pattern in the file identified by the phone file variable let's see how this works when I run the command without specifying an argument on the
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