Full Access LPI 101-500 Tutorials

The correct command to locate programs and their corresponding man pages and configuration files is whereis. The whereis command searches for the binary, source, and manual files for a given command name in a list of standard Linux directories. It can also accept a list of directories to search in by using the -B, -M, or -S options. The whereis command is useful for finding the location and documentation of a program. The other commands are not suitable for this task. The dirname command strips the last component from a file name and returns the directory name. The which command shows the full path of a command that is in the $PATH variable. The basename command strips the directory and suffix from a file name and returns the base name. The query command is not a standard Linux command. References:

• [LPI Linux Essentials - 1.1 The Linux Community and a Career in Open Source]
• [LPI Linux Essentials - 1.2 Finding Your Way on a Linux System]
• [LPI Linux Essentials - 1.4 Finding Files]
• whereis command in Linux with Examples - GeeksforGeeks
• Whereis Command in Linux | Linuxize
• Linux whereis Command Explained for Beginners (5 Examples) - HowtoForge
• whereis command | Linux# - Geek University
• whereis command in Linux - LinuxForDevices

The correct answers are C and E. Instead of supplying an explicit device in /etc/fstab for mounting, you can also use LABEL or UUID to identify the intended partition. LABEL is a human-readable name that can be assigned to a partition using tools such as e2label, tune2fs, or gparted. UUID is a universally unique identifier that is automatically generated for each partition and can be obtained using tools such as blkid or lsblk. Using LABEL or UUID instead of device names can be useful for avoiding problems caused by device name changes, such as when adding or removing disks. For example, instead of writing something like this in /etc/fstab:

/dev/sda1 /mnt/example ext4 defaults 0 0

You can write something like this:

LABEL=example /mnt/example ext4 defaults 0 0

or

UUID=80b496fa-ce2d-4dcf-9afc-bcaa731a67f1 /mnt/example ext4 defaults 0 0

The other options are not valid ways to identify a partition in /etc/fstab. FIND, ID, and NAME are not supported by the mount command or the /etc/fstab file. For more information on how to use LABEL and UUID in /etc/fstab, you can refer to the following articles:

• How to Use UUID to Mount Partitions / Volumes Under Ubuntu Linux
• How to Use Labels and UUIDs to Mount Partitions in Linux
• How to use disk quota on Linux with examples
• How to use UUIDs in fstab - LinuxConfig.org

The command line that will create or, in case it already exists, overwrite a file called data with the output of ls is ls > data. The > character is a redirection operator that redirects the standard output (STDOUT) of a command to a file. If the file does not exist, it will be created. If the file already exists, it will be overwritten. The 3> character is not a valid redirection operator. The >& character is a redirection operator that redirects both standard output (STDOUT) and standard error (STDERR) of a command to a file. The >> character is a redirection operator that appends the standard output (STDOUT) of a command to a file, without overwriting the existing file contents. References: LPI Exam 101 Detailed Objectives, Topic 103: GNU and Unix Commands, Weight: 25, Objective 103.3: Perform basic file management, Redirection

 The ps command will produce the output shown in the image. The ps command displays information about the processes running on the system. The output format can be customized by using different options. For example, ps -aux will show all processes with detailed information, such as user, PID, CPU, memory, command, and so on. The output in the image matches the format of ps -aux. The jobs command will show the status of jobs in the current shell. The proclist command is not a valid Linux command. The netstat command will show network connections, routing tables, and statistics. References: LPI Exam 101 Detailed Objectives, Topic 103: GNU and Unix Commands, Weight: 25, Objective 103.3: Perform basic file management, ps command, jobs command, netstat command