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This command shuts down the operating system, but can only be run by the root user This command shuts down and restarts the operating system It also can only be run by root
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This command also shuts down the operating system, and can only be run by your root user This command also shuts down and restarts the operating system It also can only be run by root
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This command opens the manual page for the command or utility specified The man utility is a very useful tool If you are unsure how to use any command, use man to access its manual page For example, you could enter man ls at the shell prompt to learn how to use the ls utility This is shown in Figure 1-6
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Running man is relatively easy However, many new Linux users have trouble guring out how to get out of man You can exit any man page by pressing q
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The info utility also displays a help page for the indicated command or utility The information displayed tends to be more in-depth than that displayed in the man page for the same command For example, the info utility has been used to display information about ls in Figure 1-7
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This command switches the current user to a new user account For example, if you re logged in as rtracy and need to change to user account dcoughanour, you can enter su dcoughanour at the shell prompt This command is most frequently used to switch to the superuser root account In fact, if you don t supply a username, this utility assumes that you want to change to the root account If you enter su -, then you will switch to the root user account and have all of root s environment variables applied
1: Introducing Linux
FIGURE 1-6
Using the man utility to learn how to use ls
env
This command displays the environment variables for the currently logged-in user This command is used to echo a line of text on the screen It s frequently used to display environment variables For example, if you wanted to see the current value of the PATH variable, you could enter echo $PATH
The su command is many times mistakenly thought to stand for super user It doesn t It stands for switch user
echo
Use the Linux User Interface
FIGURE 1-7
Using the info utility to learn about ls
top
The $ character tells echo that the text that comes after it is a variable, not a literal string, and that it should use the current value of that variable If you were to leave off the $, the echo command would simply display PATH on the screen
This command is a very useful command that displays a list of all applications and processes currently running on the system You can sort them by CPU usage, memory usage, process ID number, and which user owns them A sample top screen is shown in Figure 1-8
1: Introducing Linux
FIGURE 1-8
Using top to view active processes
which
This command is used to display the full path to a shell command or utility For example, if you wanted to know the full path to the ls command, you would enter which ls The full path to ls is displayed on screen, as shown in the next illustration
whoami netstat
This command displays the username of the currently logged-in user
This command displays the status of the network, including current connections, routing tables, etc
Use the Linux User Interface
FIGURE 1-9
Viewing network board parameters with ifconfig
route
This command is used to view or manipulate the system s routing table
ifconfig
This command is used to manage network boards installed in the system It can be used to display or modify your network board configuration parameters This command can only be run by the root user Sample output from ifconfig is shown in Figure 1-9
Let s practice using common Linux commands in the following exercise
EXERCISE 1-2 Using Linux Commands
In this exercise, you learn how to use common Linux commands from the shell prompt Complete the following: 1 Boot your Linux system to a shell prompt (run-level 3) If your system booted into a graphical system, log in and then press 2 At your login prompt, authenticate to the system 3 At the shell prompt, determine your current directory by entering pwd What is the current directory 4 Determine the current user by entering whoami Who is the current user 5 Create a directory listing of the files in the current directory by entering ls
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