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When using the command line interface, you are given a simple prompt at which you type in your command. Even with a GUI, you sometimes need to execute commands on a command line. Linux commands make extensive use of options and arguments. Be careful to place your arguments and options in their correct order on the command line. The format for a Linux command is the command name followed by options, and then by arguments, as shown here:
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$ command-name options arguments
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An option is a one-letter code preceded by a dash, which modifies the type of action the command takes. Options and arguments may or may not be optional, depending on the command. For example, the ls command can take an option, -s. The ls command displays a listing of files in your directory, and the -s option adds the size of each file in blocks. You enter the command and its option on the command line as follows:
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$ ls -s
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An argument is data the command may need to execute its task. In many cases, this is a filename. An argument is entered as a word on the command line after any options. For example, to display the contents of a file, you can use the more command with the file's name as its argument. The more command used with the filename mydata would be entered on the command line as follows:
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The command line is actually a buffer of text you can edit. Before you press ENTER, you can perform editing commands on the existing text. The editing capabilities provide a way to correct mistakes you may make when typing in a command and its options. The BACKSPACE and DEL keys enable you to erase the character you just typed in. With this character-erasing capability, you can BACKSPACE over the entire line if you want, erasing what you entered. CTRL-U erases the whole line and enables you to start over again at the prompt. Note You can use the UP ARROW to redisplay your previously executed command. You can then reexecute that command, or you can edit it and execute the modified command. This is helpful when you have to repeat certain operations over and over, such as editing
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the same file. This is also helpful when you've already executed a command you entered incorrectly.
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Help
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A great deal of help is already installed on your system, as well as accessible from online sources. Both the Gnome and KDE desktops feature Help systems that use a browser-like interface to display help files. To start KDE Help, click the Book icon in the panel. Here, you can select from the KDE manual, the Linux Man pages, or the GNU info pages. KDE Help features browser capabilities, including bookmarks and history lists for documents you view. To start the Gnome Help browser, click the icon with the question mark ( ) in the panel. You can then choose from the Gnome user guide, Man pages, and info pages (see Figure 3-6). The Gnome Help browser and KDE Help Center also feature bookmarks and history lists.
Figure 3-6: Gnome Help browser Both Gnome and KDE, along with other applications, such as Linuxconf, also provide context-sensitive help. Each KDE and Gnome application features detailed manuals that are displayed using their respective Help browsers. Also, applications like Linuxconf feature detailed context-sensitive help. Most panels on Linuxconf have Help buttons that display detailed explanations for the operations on that panel. Note In addition, extensive help is provided online. The Red Hat desktops display Web page icons for support pages, including online manuals and tutorials. On your system, the /usr/share/doc directory contains documentation files installed by each application. Within each directory, you can usually find HOW-TO documents for that application. You can also access the online manual for Linux commands from the command line interface using the man command. Enter man with the command on which you want information.
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