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Which of the following tar options handle compression? (Choose two correct answers.)
The tar command is used to create or extract compressed archive files that contain multiple files or directories. The tar command has the following syntax: tar [options] [archive-file] [file or directory...]. The options argument specifies how the tar command should operate and what kind of compression should be used. The archive-file argument is the name of the archive file to be created or extracted. The file or directory argument is the name of one or more files or directories to be included in or extracted from the archive file.
The following are some of the common options for the tar command:
-c: create a new archive file.
-x: extract files from an existing archive file.
-t: list the contents of an archive file.
-v: show the progress of the operation.
-f: specify the name of the archive file.
-z: use gzip compression or decompression.
-j: use bzip2 compression or decompression.
-J: use xz compression or decompression.
The options -z and -j are used to handle compression with the tar command. The option -z uses the gzip program to compress or decompress the archive file, which usually has the extension .tar.gz or .tgz. The option -j uses the bzip2 program to compress or decompress the archive file, which usually has the extension .tar.bz2 or .tbz. Both gzip and bzip2 are popular compression programs that reduce the size of files by removing redundant or unnecessary information.
For example, to create a compressed archive file called backup.tar.gz that contains the files and directories in the current directory, the following command can be used:
tar -czvf backup.tar.gz .
To extract the files and directories from the archive file backup.tar.gz to the current directory, the following command can be used:
tar -xzvf backup.tar.gz
To create a compressed archive file called backup.tar.bz2 that contains the files and directories in the current directory, the following command can be used:
tar -cjvf backup.tar.bz2 .
To extract the files and directories from the archive file backup.tar.bz2 to the current directory, the following command can be used:
tar -xjvf backup.tar.bz2
The other options in the question are not related to compression. The option -bz is invalid, as there is no such option for the tar command. The option -g is used to create or update an incremental archive file, which only contains the files that have changed since the last backup. The option -z2 is also invalid, as there is no such option for the tar command.Reference:
Linux Essentials Version 1.6 Objectives: 3.1.Archiving Files on the Command Line1
A directory contains the following three files:
texts 1.txt
texts 2.txt
texts 3.csv
Which command copies the two files ending in .txt to the /tmp/ directory?
What are the differences between a private web browser window and a regular web browser window? (Choose three.)
A private web browser window is a mode of browsing that prevents the browser from saving your browsing history, cookies, and other site data, or information entered in forms. However, it does not prevent websites, your employer or school, or your internet service provider from tracking your online activity. The main differences between a private web browser window and a regular web browser window are:
Private web browser windows do not store cookies persistently. Cookies are small files that websites use to store information on your device, such as your preferences, login status, or tracking data. In a regular web browser window, cookies are stored until they expire or you delete them. In a private web browser window, cookies are deleted when you close all private windows.
Private web browser windows do not keep records in the browser history. The browser history is a list of web pages that you have visited in the past. In a regular web browser window, the browser history is saved and can be accessed by anyone who uses the same device or profile. In a private web browser window, the browser history is not saved and cannot be viewed by anyone.
Private web browser windows do not send regular stored cookies. When you visit a website in a regular web browser window, the browser sends any cookies that are stored for that website. This allows the website to recognize you and provide personalized content or services. When you visit a website in a private web browser window, the browser does not send any cookies that are stored in regular windows. This prevents the website from identifying you or linking your activity across different sessions.
Which of the following commands finds all lines in the file operating-systems.txt which contain the term
linux, regardless of the case?
Which of the following values could be a process ID on Linux?
A process ID on Linux is a unique integer value that identifies a running process. The process ID can range from 0 to a maximum limit, which is usually 32768 or higher, depending on the system configuration. The process ID of 0 is reserved for the kernel's idle task, and the process ID of 1 is reserved for the init system, which is the first process launched by the kernel. The process IDs are assigned sequentially to new processes, and are recycled when a process terminates. Therefore, the only valid value for a process ID among the given options is 21398, which is an integer within the possible range. The other values are not valid process IDs because they are either strings, hexadecimal numbers, or file paths, which do not match the format of a process ID on Linux.Reference:
