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| Section | Weight | Objectives |
|---|---|---|
| The Power of the Command Line | 25% | - Archiving and Compression - Text Processing - I/O Redirection and Pipelines - Basic Shell Scripting |
| The Linux Operating System | 20% | - File Systems and Hierarchy Standard - Processes and Services - Hardware and Drivers - System Architecture |
| The Linux Community and a Career in Open Source | 15% | - Applications and Support - Linux Distributions - Linux History and Philosophy - Open Source Software and Licensing |
| Finding Your Way on a Linux System | 20% | - Using Directories and Listing Files - Command Line Basics - Creating, Moving and Deleting Files |
| Security and File Permissions | 20% | - User and Group Management - Basic Security Concepts - File Permissions and Ownership |
Viel Zeit und Geld auszugeben ist nicht so gut als eine richtige Methode auszuwählen. Wenn Sie jetzt auf die Lpi 010-160 Prüfung vorbereiten, dann ist die Software, die vom Team der It-Pruefung hergestellt wird, ist Ihre beste Wahl. Unser Ziel ist sehr einfach, dass Sie die Lpi 010-160 Prüfung bestehen. Wenn das Ziel nicht erreicht wird, bieten wir Ihnen volle Rückerstattung, um ein Teil Ihres Verlustes zu kompensieren. Bitte glauben Sie unsere Herzlichkeit! Wir wünschen Ihnen viel Glück beim Test der Lpi 010-160!
101. Frage
Which of the following commands can be used to resolve a DNS name to an IP address?
Antwort: A
Begründung:
Explanation
The host command is used to resolve a DNS name to an IP address or vice versa. It can also perform other DNS queries, such as finding the mail servers for a domain. The host command has the following syntax: host
[options] [name] [server]. The name argument can be a hostname, such as www.lpi.org, or an IP address, such as 192.168.0.1. The server argument is optional and specifies the name or IP address of the DNS server to query. If no server is given, the default system resolver is used. References:
* Linux Essentials Version 1.6 Objectives: 1.4.1. Demonstrate an understanding of the purpose and types of DNS records1
* Linux Essentials Version 1.6 Exam Study Resources: Linux Essentials Manual - Chapter 10. Network Fundamentals - 10.3. DNS and Hostname Resolution - 10.3.1. The host Command2
* Linux Essentials Version 1.6 Exam Study Resources: Linux Essentials Manual - Appendix A. Answers to the Exercises - Chapter 10. Network Fundamentals - 10.3. DNS and Hostname Resolution - Exercise
10.3.12
102. Frage
The file script.sh in the current directory contains the following content:
#!/bin/bash echo $MYVAR
The following commands are used to execute this script:
MYVAR=value
./script.sh
The result is an empty line instead of the content of the variable MYVAR. How should MYVAR be set in order to make script.sh display the content of MYVAR?
Antwort: A
Begründung:
Explanation
The reason why the script.sh does not display the content of the variable MYVAR is that the variable is not exported to the environment of the script. When a script is executed, it runs in a separate process that inherits the environment variables from the parent process, but not the shell variables. A shell variable is a variable that is defined and visible only in the current shell session, while an environment variable is a variable that is exported to the environment and visible to all processes that run in that environment1.
To make a shell variable an environment variable, we need to use the export command. The export command takes a shell variable name and adds it to the environment of the current shell and any subshells or processes that are created from it2. For example, to export the variable MYVAR with the value value, we can use:
export MYVAR=value
This will make the variable MYVAR available to the script.sh when it is executed, and the script will print the value of MYVAR as expected. Alternatively, we can also use the export command with the -n option to remove a variable from the environment, or with the -p option to list all the environment variables2.
The other options are not valid ways to set MYVAR as an environment variable. The !MYVAR=value option is not a valid syntax for setting a variable in bash. The env MYVAR=value option will run the env command with the MYVAR=value argument, which will print the environment variables with the addition of MYVAR=value, but it will not affect the current shell or the script.sh3. The MYVAR=value option will set MYVAR as a shell variable, but not as an environment variable, so it will not be visible to the script.sh1. The
$MYVAR=value option will try to set the variable whose name is the value of MYVAR to the value value, which is not what we want4. References:
* Linux Essentials Exam Objectives, Version 1.6, Topic 103.1, Weight 2
* Linux Essentials Certification Guide, Chapter 3, Page 51-52
* env(1) - Linux manual page
* Bash Variables - LinuxConfig.org
103. Frage
Which criteria are useful when deciding which operating system to use? (Select THREE answers)
Antwort: A,C,D
104. Frage
What is the purpose of the PATH environment variable?
Antwort: D
Begründung:
The PATH environment variable is a special variable that contains a list of directories that the system searches when looking for a command to execute12. The purpose of the PATH variable is to make it easier and faster for users to run commands without having to type the full path to the executable file. For example, if you want to run the ls command, which is located in the /bin directory, you don't have to type /bin/ls every time. You can just type ls, and the system will find the executable file in the /bin directory, which is one of the directories in the PATH variable. The PATH variable can be viewed with the echo command12:
$ echo $PATH
The PATH variable can also be modified by adding or removing directories, either temporarily or permanently, depending on the user's needs12. For example, if you have a custom script or program in your home directory, and you want to run it from anywhere, you can add your home directory to the PATH variable with the export command12:
$ export PATH=$PATH:~/myprogram
This will append your home directory to the end of the PATH variable, and the system will search it last when looking for a command. To make this change permanent, you need to edit a configuration file, such as ~/.bashrc or ~/.profile, and add the export command there12.
Reference:
How To View and Update the Linux PATH Environment Variable | DigitalOcean Linux path environment variable - Linux command line - LinuxConfig.org
105. Frage
What is true about arecursive directory listing?
Antwort: B
106. Frage
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010-160 Simulationsfragen: https://www.it-pruefung.com/010-160.html
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