<caption><image_44>The image shows a man sitting at a desk in an office. He is wearing a white shirt and a maroon tie. He has a beard and is looking directly at the camera. Behind him, there is a bookshelf and a computer monitor. On the desk, there are several books and a telephone. The man appears to be in his late 40s or early 50s.</caption><caption><image_45>The image shows a man sitting at a desk in front of a computer. He is wearing a white shirt and a maroon tie. He has a beard and is looking directly at the camera with a serious expression on his face. Behind him, there is a bookshelf and a computer monitor. The man appears to be in his late twenties or early thirties.</caption> is allowed with this echo statement when all of these are assembled together we get a case statement that looks like this you see each command is identified by a pattern to match in the end of each command has double semicolons for the end of that conditional section for now this is as far as we want to extend the pH find command although we'll do more later I've entered this command into a file on my system and call that pH find one here you see the contents of pH find one let me execute the different versions of the command so you can see pH find one without an argument now prints out a message pH find one with an argument finds that line in the phone list pH find one with two patterns prints out the message too many patterns only one allowed two or more arguments will result in that last message while this correctly handles variable number of arguments it still doesn't solve the problem of what happens when the user enters a pattern that's not found in the phone list for example I'm not in the phone list if I search for the name Swartz you see that I get no output at all in my experience users get confused when programs don't provide adequate output to provide some feedback pH fine should tell the user that their pattern was not found in the list the question is how to do that the shell provides the answer in
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