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[General] 101-500 Formal Test, 101-500 Examcollection Questions Answers

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【General】 101-500 Formal Test, 101-500 Examcollection Questions Answers

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Lpi LPIC-1 Exam 101, Part 1 of 2, version 5.0 Sample Questions (Q84-Q89):NEW QUESTION # 84
From a Bash shell, which of the following commands directly executes the instruction from the file
/usr/local/bin/runme.sh without starting a subshell? (Please select TWO answers.)
  • A. run /usr/local/bin/runme.sh
  • B. source /usr/local/bin/runme.sh
  • C. . /usr/local/bin/runme.sh
  • D. /bin/bash /usr/local/bin/runme.sh
  • E. /usr/local/bin/runme.sh
Answer: B,C
Explanation:
Explanation
The commands that directly execute the instruction from the file /usr/local/bin/runme.sh without starting a subshell are source /usr/local/bin/runme.sh and . /usr/local/bin/runme.sh. These commands use the source or dot builtins, which read and execute commands from the given file in the current shell environment. This means that any changes made by the file, such as setting variables, defining functions, or changing directories, will affect the current shell. This is different from running the file as a script, which will create a new shell process and execute the commands in a separate environment. The source or dot commands are useful for loading configuration files, such as ~/.bashrc or /etc/profile, or for running scripts that modify the current state of the shell.
The other commands are incorrect for the following reasons:
* C. /bin/bash /usr/local/bin/runme.sh: This command will run the file as a script using the /bin/bash interpreter. This will create a new shell process and execute the commands in a separate environment.
Any changes made by the file will not affect the current shell.
* D. /usr/local/bin/runme.sh: This command will also run the file as a script, but using the interpreter specified by the shebang line (#!) at the beginning of the file. If the file does not have a shebang line, it will use the default shell interpreter, which may or may not be /bin/bash. This will also create a new shell process and execute the commands in a separate environment. Any changes made by the file will not affect the current shell.
* E. run /usr/local/bin/runme.sh: This command is not valid, as there is no builtin or external command called run. This will produce an error message.
References:
* [LPI Exam 101 Detailed Objectives], Topic 103: GNU and Unix Commands, Objective 103.1: Work on the command line, Weight: 4, Key Knowledge Areas: Use of source and ..
* [Bash Reference Manual], Section 4.2: Bash Builtin Commands, Subsection 4.2.5: Bourne Shell Builtins.

NEW QUESTION # 85
What does the command mount -a do?
  • A. It mounts all user mountable filesystems for the current user.
  • B. It shows all mounted filesystems.
  • C. It mounts all available filesystems onto the current directory.
  • D. It mounts all filesystems listed in /etc/fstab which have the option noauto set.
  • E. It mounts all filesystems listed in /etc/fstab which have the option auto set.
Answer: E
Explanation:
The command mount -a mounts all filesystems that are listed in the file /etc/fstab and have the option auto set.
The option auto means that the filesystem can be mounted automatically by the mount -a command or at boot time. The option noauto means that the filesystem can only be mounted explicitly by the mount command with the device or mount point specified12. The file /etc/fstab contains information about the filesystems that are known to the system and how they can be mounted3. The command mount -a is useful for mounting all the filesystems that are needed by the system after a change in /etc/fstab or after a reboot4. References: 1:
mount(8) - Linux man page 2: Linux mount and umount commands help and examples 3: fstab(5) - Linux man page 4: How to Use the mount Command on Linux

NEW QUESTION # 86
A Debian package creates several files during its installation. Which of the following commands searches for packages owning the file /etc/debian_version?
  • A. apt -r /etc/debian_version
  • B. dpkg -S /etc/debian_version
  • C. find /etc/debian_version -dpkg
  • D. apt-file /etc/debian_version
  • E. apt-get search /etc/debian_version
Answer: B
Explanation:
Explanation
The command that searches for packages owning the file /etc/debian_version is dpkg -S /etc/debian_version.
The dpkg command is the low-level tool for installing, removing, configuring, and querying Debian packages.
The -S or --search option takes a file name or a pattern as an argument and searches for the packages that contain the matching files. The output shows the package name and the file name separated by a colon. For example, running dpkg -S /etc/debian_version will produce the output base-files:/etc/debian_version, indicating that the file /etc/debian_version belongs to the base-files package. The other commands are either invalid or do not perform the desired task. The apt-get command is used to download and install packages from the Debian repositories, but it does not have a search option. The aptcommand is a high-level tool for managing packages, but it does not have a -r option. The find command is used to search for files in the file system, but it does not have a -dpkg option. The apt-file command is used to search for files in the packages available in the Debian repositories, but it requires a subcommand such as search or show before the file name or pattern. References:
* Linux Essentials - Linux Professional Institute Certification Programs1
* Exam 101 Objectives - Linux Professional Institute2
* dpkg(1) - Linux manual page3
* apt-get(8) - Linux manual page
* apt(8) - Linux manual page
* find(1) - Linux manual page
* apt-file(1) - Linux manual page

NEW QUESTION # 87
SIMULATION
Which program updates the database that is used by the locate command?
Answer:
Explanation:
updatedb

NEW QUESTION # 88
Which of the following commands print the current working directory when using a Bash shell? (Choose two.)
  • A. echo "${pwd}"
  • B. pwd
  • C. echo "${PWD}"
  • D. echo "${WD}"
  • E. printwd
Answer: B,C
Explanation:
Explanation/Reference:

NEW QUESTION # 89
......
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