Most Recent LPI 102-500 Exam Dumps

The date command is used to display or set the system's date and time. The date command has the following syntax:

date [options] [+format] [time]

The options can modify the behavior of the date command, such as setting the time zone, printing the date in RFC 3339 format, or updating the hardware clock. The +format argument can specify the output format of the date command, using various conversion specifiers that represent different components of the date and time, such as %Y for the year, %m for the month, %d for the day, %H for the hour, %M for the minute, and %S for the second. The time argument can set the system's date and time, using the format MMDDhhmm[[CC]YY][.ss], where MM is the month, DD is the day, hh is the hour, mm is the minute, CC is the century, YY is the year, and ss is the second.

Therefore, the date command can accomplish the following tasks:

A . Set the system's date and time. For example, to set the system's date and time to November 8, 2023, 18:30:00, the command would be:

date 110818302023.00

E . Display time in a specific format. For example, to display the current date and time in the format YYYY-MM-DD HH:MM:SS, the command would be:

date +%Y-%m-%d %H:%M:%S

The other options in the question are not correct for this task. The date command cannot set the system's date but not the time, as the time argument requires both the date and the time components. The date command cannot calculate the time span between two dates, as it can only display or set the current date and time. The date command cannot print a calendar for a month or a year, as that is the function of the cal command.

LPI 102-500 Exam Objectives, Topic 105.1: Customize and use the shell environment

LPI 102-500 Study Guide, Chapter 5: Customizing Shell Environments, Section 5.1: Working with the Shell

date man page

The file /etc/cron.allow, if present, must contain all users that are allowed to use the cron scheduling system. This file is used to restrict the access to cron for security reasons. Only users listed in this file can create and edit their own crontab files using the crontab command.If the file does not exist, all users can use cron, unless the file /etc/cron.deny exists, which lists the users that are not allowed to use cron12.Reference:1:Cron and Crontab usage and examples.2:How to use cron in Linux.

The useradd command is used to create new user accounts in Linux. It has many options that can be specified to customize the user creation process. Two of these options are:

-d, --home HOME_DIR: This option allows the user to specify the absolute path to the user's home directory. The default is to append the username to the base directory specified by the HOME variable in /etc/default/useradd, or /home by default.The directory does not have to exist but will not be created if it is missing12

-u, --uid UID: This option allows the user to specify the numeric user ID (UID) of the user. The UID must be unique and not already in use by another user.The default is to use the next available UID from the range specified by the UID_MIN and UID_MAX variables in /etc/login.defs13

The Bash shell can be configured by various files that affect its behavior, such as setting environment variables, aliases, functions, options, and prompts. Some of these files are global, meaning they apply to all users of the system, and some are local, meaning they apply to individual users.The global files are usually located in the /etc directory, while the local files are usually located in the user's home directory, which is denoted by the tilde (~) symbol1.

The local files that affect the Bash shell are:

~/.bash_profile: This file is executed when a user logs in to the system. It is used to set up the user's environment, such as the PATH, the default editor, the umask, and other variables. It can also run commands that are needed only once per login session, such as ssh-agent or fortune.This file can also source other files, such as ~/.bashrc, to inherit their settings12.

~/.bashrc: This file is executed when a user starts a new interactive shell, such as opening a terminal window or running a script with the shebang #!/bin/bash. It is used to set up the user's shell preferences, such as aliases, functions, options, and prompts.It can also source other files, such as /etc/bashrc, to inherit their settings12.

~/.bash_logout: This file is executed when a user logs out of the system.It is used to perform any cleanup tasks, such as clearing the screen, deleting temporary files, or printing a farewell message1.

The other files listed in the question are not valid Bash configuration files and do not affect the behavior of the shell. Therefore, the correct answer is B. ~/.bashrc and E. ~/.bash_profile.

The xwininfo command is a utility for displaying information about windows on an X server. One of the information it displays is the depth of the window, which is the number of bits per pixel used to represent the color of the window. The depth of the root window, which is the background window of the X server, is the same as the color depth of the X server. To display the depth of the root window, one can use the command xwininfo -root and look for the line that says ''depth of root window''. Alternatively, one can use the command xdpyinfo, which displays information about the X server, and look for the line that says ''depths of root window''.Reference:

xwininfo(1) - Linux man page

xdpyinfo(1) - Linux man page

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