<caption><image_41>The image is a blackboard with white text written on it. The text reads "case $ in" and "0 print usage message". Below the text, there is a code that reads "1 search for pattern". 

Below the code, there are two options - "print error message" and "#esc". The code appears to be written in a programming language, as indicated by the "esc" text. The background of the blackboard is white.</caption> line or command lines to be executed only one of these three lines will get executed when the script is run by the user the one in this case that gets executed is the one that identifies the number of command line arguments passed to pH find if there are zero the first line gets executed if there's only one the second line gets executed the star recall matches zero or more of any characters in the shell that means that whatever pattern is in the case statement the star will match it the star then is the wild-card character that says if zero and one don't match the pattern then run this command line it's the one that's going to say no
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