<caption><image_56>The image shows a man standing in an office. He is wearing a white shirt and a red tie. He has a beard and is looking directly at the camera with a serious expression. Behind him, there is a desk with a computer monitor, a telephone, and a bookshelf. The room appears to be well-lit with natural light coming in from the window.</caption><caption><image_57>The image is a slide from a presentation. It has a dark blue background with white text. The text reads "Upper-case characters" and "Lower-case character" in a larger font size. Below the text, there is a smaller text that reads "0-9". The slide appears to be part of a larger presentation or presentation.</caption><caption><image_58>The image is a screenshot of a text message on a computer screen. The message reads "The system administrator is rich. Have a great day. $ name." The text is written in green color and is in a simple, sans-serif font. The background of the screen is black.</caption> system here's what it looks like now if I ask pH find 2 to locate swartz the message I get is that Swartz was not found in the phone list in addition to the logical or operator the shell also supplies a logical and operator this is represented by two ampersands the logical and operator only execute command B F command a succeeds which is just the opposite of the logical or operator F command a fails then command B doesn't get executed the text contains a couple of examples of using both a this marks the end of this section please review the manual and refer to the chapters in the text that cover the case statement and the logical operators then work the exercises suggested in the before we can continue on and do more advanced shell programming we have to learn about how the shell handles variables you're probably aware that variables are ways to store data temporarily inside a programming language the shells variables are like those in other languages they have to start with an upper or lowercase character and they can contain characters or digits in the name like most computer languages you can assign variables values with assignment character the equal sign for example if I want to store my name in a variable
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