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| Section | Objectives |
|---|---|
| Topic 1: Security and File Permissions | - Users and Groups - File Permissions and Ownership - Basic Security Concepts |
| Topic 2: The Linux Community and a Career in Open Source | - Linux Evolution and Popular Operating Systems - Open Source Software and Licensing - ICT Skills and Working in Linux - Major Open Source Applications |
| Topic 3: Finding Your Way on a Linux System | - Command Line Basics - File and Directory Operations - Filesystem Navigation |
| Topic 4: The Power of the Linux Command Line | - Basic Commands and Utilities - Introduction to Shell and Scripting Concepts - Working with Text Streams |
| Topic 5: The Linux Operating System | - Processes and System Resources - Operating System Components - Package Management Basics |
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NEW QUESTION # 48
Which of the following are typical services offered by public cloud providers? (Choose three.)
Answer: B,D,E
NEW QUESTION # 49
Which of the following outputs comes from the commandfree?
Answer: D
NEW QUESTION # 50
Which operator in a regular expression matches the preceding character either zero or one time?
Answer: D
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 # 51
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?
Answer: A
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. Reference:
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
NEW QUESTION # 52
What can be found in the /proc/ directory?
Answer: C
NEW QUESTION # 53
......
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