that guide you through typical situations you will encounter as a UNIX network administrator.
These simulations allow you to enter specific UNIX commands and see the results of those commands without having to leave the learning environment. On a real UNIX system, many commands can be entered in several ways. For the purposes of the online simulations, we will specify how the commands need to be entered and supply you with correct answers at each step.
Each simulation is accompanied by a set of text instructions, which describe the steps in the simulation. These instructions provide a review of the material covered that you can use if you are unable to run the Simulation.
Linux Command Line Display
The file has the read permission and write permission bits set for the owner.
However, the execute bit is not set for the owner.
Using the Shell
When you first start using the shell, it can be intimidating. All you see is a prompt. How do you know which commands are available, which options they use, or how to use advanced features? Fortunately, lots of help is available. Here are some places you can look to supplement what you learn in this chapter:
Check the PATH.Type echo $PATH. You see a list of the directories containing commands that are immediately accessible to you. Listing the contents of those directories displays most standard Linux commands.
Use the help command.Some commands are built into the shell, so they do not appear in a directory.
The help command lists those commands and shows options available with each of them. (Type help | less to page through the list.) For help with a particular built-in command, type help command, replacing command with the name that interests you.
The help command works with the bash shell only.
with the command. Many commands include a --help option that you can use to get information about how the command is used.
For example, type date --help | less. The output shows not only options, but also time formats you can use with the date command
Use the man command. To learn more about a particular command, type man command. (Replace command with the command name you want.) A description of the command and its options appears on the screen.
Occasionally in this course,
will be examined.
You can avoid any confusion by either closing the new window after you have viewed the contents, or moving it to the side so that it is visible along with the main window.
Linux Network Administration Glossary
Many terms used in the course are defined in a glossary. The glossary terms are italicized in the lesson or exercise text.
Glossary terms in the page contain a footnote with the definition at the bottom of the page.
The glossary for this course can be found at Linux Network Admin - Glossary.
In addition, the last lesson in every module reviews the key terms introduced in the module and provides a glossary link for each term.