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| Section | Objectives |
|---|---|
| Topic 1: The Power of the Linux Command Line | - Introduction to Shell and Scripting Concepts - Working with Text Streams - Basic Commands and Utilities |
| Topic 2: The Linux Community and a Career in Open Source | - Open Source Software and Licensing - ICT Skills and Working in Linux - Linux Evolution and Popular Operating Systems - Major Open Source Applications |
| Topic 3: The Linux Operating System | - Package Management Basics - Processes and System Resources - Operating System Components |
| Topic 4: Security and File Permissions | - Basic Security Concepts - File Permissions and Ownership - Users and Groups |
| Topic 5: Finding Your Way on a Linux System | - Filesystem Navigation - File and Directory Operations - Command Line Basics |
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NEW QUESTION # 124
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: B
Explanation:
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
NEW QUESTION # 125
FILL BLANK
What keyword is used in a shell script to begin a loop? (Specify one keyword only, without any additional information.)
Answer:
Explanation:
for
NEW QUESTION # 126
What information can be displayed by top?
Answer: C
Explanation:
The top command is a Linux command that shows the running processes on the system. It provides a dynamic real-time view of the system performance and resource usage. The top command can display various information about the processes, such as their process ID, user, priority, state, CPU and memory usage, command name, and more. The top command can also sort the processes by different criteria, such as CPU or RAM consumption, by using the interactive commands. The top command is useful for monitoring the system load and identifying the processes that are consuming the most resources. Reference:
Linux Essentials Topic 104: The Linux Operating System, section 104.3: Basic features and commands of the Linux standard shells.
Linux Essentials Topic 106: Security and File Permissions, section 106.4: Monitor and manage Linux processes.
NEW QUESTION # 127
What is the UID of the user root?
Answer: D
NEW QUESTION # 128
Which of the following devices represents a hard disk partition?
Answer: D
NEW QUESTION # 129
......
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