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uname command, 412, 420
Unix, 6–8
URL (uniform resource locator), 361
user accounts
adding, 37–38, 141–43
managing, 140–48, 432–35
useradd command, 433–34
user-defined variables, 458–60
user input, 460–61
user interfaces
command-line, 39, 49–52
graphical. See graphical user interface
usernames, 38
utilities. See system tools
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