All 101-500 Test Inside LPI Questions

 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

The command mount -a ensures that all file systems listed with the option auto in /etc/fstab are mounted. The /etc/fstab file contains the information about the file systems that can be mounted automatically or manually. The option auto means that the file system can be mounted automatically at boot time or when the command mount -a is issued. The option noauto means that the file system can only be mounted manually by specifying the device or mount point. The command mount -a ignores the file systems with the noauto option and mounts the rest of the file systems that are not already mounted. The other options are incorrect because they do not describe the correct behavior of the command mount -a. Option A is wrong because the command mount -a ignores the file systems with the noauto option. Option B is wrong because the command mount -a does not show any output, unless the -v option is used. To show the mounted file systems, the command mount without any arguments can be used. Option C is wrong because the command mount -a does not open any editor. To edit the /etc/fstab file, a text editor such as vi, nano, or gedit can be used. Option E is wrong because the command mount -a does not mount all file systems listed in /etc/fstab, but only those with the auto option. References:

[LPI Linux Essentials - 2.2 Mounting, Unmounting Filesystems]

Linux mount Command with Examples - phoenixNAP

How does the Linux command “mount -a” work? - Unix & Linux Stack Exchange

mount command in Linux with Examples - GeeksforGeeks

mountコマンドについてまとめました【Linuxコマンド集】

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 commands that will print important system information such as the kernel version and machine hardware architecture are uname and arch. The uname command prints system information, such as the kernel name, release, version, machine, processor, hardware platform, and operating system. The arch command prints the machine hardware name, which is equivalent to uname -m. For example, uname -a will print Linux 5.10.0-8-amd64 #1 SMP Debian 5.10.46-4 (2021-08-03) x86_64 GNU/Linux, and arch will print x86_64. The sysinfo command is not a valid Linux command. The lspci command prints information about PCI buses and devices in the system. The info command prints documentation for a given topic or command. References: LPI Exam 101 Detailed Objectives, Topic 103: GNU and Unix Commands, Weight: 25, Objective 103.1: Work on the command line, uname command, arch command, lspci command, info command