TAILIEUCHUNG - glossary.xml

A command is an instruction that you can give to a program running on the Unix system. For instance, you can type a program’s name and arguments on a command line, at a shell prompt; this command asks the shell to run that pr ogram. (The shell is a program itself; see shell.) Once a program starts running, it may accept commands of its own. For example, a text editor has commands for deleting and adding text to the file it’s editing. | Glossary alphanumeric Characters letters alpha and numbers numeric including punctuation characters such as _ and . click Depress and quickly release a mouse button double- and triple-click imply depressing and releasing a mouse button two or three times respectively within a short period. You ll usually click with the first mouse button which is the left mouse button for righthanded users or the opposite if your mouse has been configured for a lefthanded user . See also point. clipboard A temporary storage area for X Window System programs used for transferring text copying and pasting text between programs. command A command is an instruction that you can give to a program running on the Unix system. For instance you can type a program s name and arguments on a command line at a shell prompt this command asks the shell to run that program. The shell is a program itself see shell. Once a program starts running it may accept commands of its own. For example a text editor has commands for deleting and adding text to the file it s editing. The terms command and program are used almost interchangeably probably because the program name is typed first on a command line at a shell prompt . Shells have some built-in commands that don t start a separate program running one of these is cd which changes the shell s working directory. cracker A malicious person who tries to break into computer systems usually via a network disrupt computers and networks steal secrets like passwords and credit card numbers and other antisocial behavior. 143 7 January 2002 13 14 144 Glossary Popular media often call these people hackers. But to most computer programmers a hacker is someone who enjoys computing and programming and may be an expert at some area of it. For instance a Perl hacker is someone who s good at programming in the Perl language. desktop The part of a display that s behind not enclosed within the windows icons and other items on the display. Also called the root window. .

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