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| Section | Weight | Objectives |
|---|---|---|
| The Linux Community and a Career in Open Source | 15% | - Linux Distributions - Applications and Support - Open Source Software and Licensing - Linux History and Philosophy |
| Security and File Permissions | 20% | - User and Group Management - File Permissions and Ownership - Basic Security Concepts |
| Finding Your Way on a Linux System | 20% | - Command Line Basics - Creating, Moving and Deleting Files - Using Directories and Listing Files |
| The Linux Operating System | 20% | - Hardware and Drivers - File Systems and Hierarchy Standard - System Architecture - Processes and Services |
| The Power of the Command Line | 25% | - I/O Redirection and Pipelines - Basic Shell Scripting - Text Processing - Archiving and Compression |
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NEW QUESTION # 77
Which operator in a regular expression matches the preceding character either zero or one time?
Answer: B
Explanation:
Explanation
The operator that matches the preceding character either zero or one time in a regular expression is the question mark (?). This operator is also known as the optional quantifier, because it makes the preceding character or group of characters optional. For example, the regular expression colou?r matches both color and colour, because the u is optional. The question mark can also be used to modify other quantifiers, such as * (zero or more), + (one or more), or {m,n} (between m and n times), to make them non-greedy, meaning they will match the shortest possible string instead of the longest. For example, the regular expression .*? matches any character zero or more times, but as few as possible. The question mark is one of the basic regular expression operators covered in the Linux Essentials certification program from the Linux Professional Institute (LPI). References:
* Linux Essentials - Linux Professional Institute (LPI)
* Regular Expressions:Difference between 'optional occurrence' and 'zero ...
NEW QUESTION # 78
A directory contains the following files:
What would be the output of the following shell script?
for file in *.txt
*.txt
Answer: E
NEW QUESTION # 79
Which package management tool is used in Red Hat-based Linux Systems?
Answer: A
Explanation:
Explanation
RPM stands for RPM Package Manager (formerly known as Red Hat Package Manager), which is a powerful, command-line package management tool developed for the Red Hat operating system. It is now used as a core component in many Linux distributions such as CentOS, Fedora, Oracle Linux, openSUSE and Mageia1. RPM can install, uninstall,and query individual software packages, but it cannot manage dependency resolution like YUM2. YUM is another package management tool that is based on RPM and can handle dependencies automatically. YUM is the primary package management tool for installing, updating, removing, and managing software packages in Red Hat Enterprise Linux2. Therefore, the correct answer is B. rpm, as it is the underlying package management tool used in Red Hat-based Linux systems. References:
* Linux package management with YUM and RPM | Enable Sysadmin
* Chapter 13. Package Management Tool Red Hat Enterprise Linux 5 | Red Hat Customer Portal
* Difference Between YUM and RPM | 2DayGeek
NEW QUESTION # 80
The ownership of the file doku.odt should be changed. The new owner is named tux. Which command accomplishes this change?
Answer: B
NEW QUESTION # 81
Which of the following commands output the content of the file Texts 2.txt? (Choose two.)
Answer: A,C
Explanation:
Explanation
The correct commands to output the content of the file Texts 2.txt are A and E. These commands use the cat command, which stands for concatenate, to display the content of one or more files. The cat command can take one or more filenames as arguments and print their content to the standard output (usually the terminal screen)12. The commands A and E use different ways to deal with the space character in the filename. The space character is a special character in Linux that separates words and commands. To prevent the shell from interpreting the space as a word separator, the commands A and E use either of the following methods34:
* Option A uses single quotes (') around the filename to preserve the literal value of the space character.
This tells the shell to treat the filename as a single argument and pass it to the cat command. For example: cat 'Texts 2.txt'
* Option E uses a backslash () before the space character to escape its special meaning. This tells the shell to ignore the space as a word separator and treat it as part of the filename. For example: cat Texts\ 2.txt The other options are incorrect because they use different syntax that do not output the content of the file. For example:
* Option B uses a double dash (-) before the filename to indicate the end of options. This is usually used to prevent the shell from interpreting a filename that starts with a dash (-) as an option. However, in this case, the filename does not start with a dash, so the double dash is unnecessary and will cause the command to fail. For example: cat - Texts 2.txt
* Option C uses vertical bars (|) around the filename to indicate a pipe. A pipe is a way of connecting the output of one command to the input of another command. However, in this case, there is no command before or after the pipe, so the pipe is meaningless and will cause the command to fail. For example: cat
|Texts 2.txt|
* Option D uses single quotes (') and a backslash () together around the filename. This is redundant and will cause the command to fail. The single quotes already preserve the literal value of the space character, so the backslash is not needed. Moreover, the backslash inside the single quotes will be treated as part of the filename, not as an escape character. For example: cat 'Texts\ 2.txt' References: 1: How to Use Linux Cat Command (With Examples) - phoenixNAP 2: Cat command in Linux with examples - GeeksforGeeks 3: How to escape spaces in path during scp copy in Linux? - Stack Overflow 4: How to handle spaces in file names when using xargs on find results? - Ask Ubuntu
NEW QUESTION # 82
......
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