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NEW QUESTION # 39
Given the following input stream:
txt1.txt
atxt.txt
txtB.txt
Which of the following regular expressions turns this input stream into the following output stream?
txt1.bak.txt
atxt.bak.txt
txtB.bak.txt
s/^.txt/.bak/
- A. s/^txt$/.bak^/
- B.
- C. s/txt$/bak.txt/
- D. s/[.txt]/.bak$1/
- E. s/txt/bak.txt/
Answer: A
NEW QUESTION # 40
Which of the following commands redirects the output of ls to standard error?
- A. ls |error
- B. ls >-1
- C. ls <<ERR
- D. ls >&2
- E. ls >>2
Answer: D
Explanation:
This command redirects the output of ls to standard error, which is file descriptor 2 by default. The syntax of the command is:
ls >& file_descriptor
The ls command is a utility that lists the files and directories in the current working directory or a specified directory. The >& symbol is a redirection operator that redirects the standard output of a command to another file descriptor, which can be a file, a device, or another stream. The file_descriptor is the number of the file descriptor to which the output is redirected.
Therefore, the command ls >&2 will run the ls command and redirect its output to file descriptor 2, which is standard error. This means that the output of ls will not be displayed on the screen, but sent to the standard error stream, which can be used for error handling or logging purposes.
The other commands are incorrect for the following reasons:
* A, ls >-1: This command will not redirect the output of ls to standard error, but it will cause an error.
The > symbol is a redirection operator that redirects the standard output of a command to a file or device, overwriting any existing content. The -1 argument is not a valid file name or device name, and it will cause the shell to report an error and exit.
* B, ls <<ERR: This command will not redirect the output of ls to standard error, but it will use a here document as the standard input of ls. The << symbol is a redirection operator that redirects the standard input of a command from a here document, which is a block of text that follows the command. The ERR argument is the delimiter that marks the end of the here document. However, the ls command does not read from the standard input, and it will ignore the here document. The command will display the files and directories in the current working directory on the screen, as usual.
* D, ls >>2: This command will not redirect the output of ls to standard error, but it will append the output of ls to a file named 2. The >> symbol is a redirection operator that redirects the standard output of a command to a file or device, appending to any existing content. The 2 argument is the name of the file to which the output is appended. If the file does not exist, it will be created. The command will not display anything on the screen, but write the output of ls to the file 2.
* E, ls |error: This command will not redirect the output of ls to standard error, but it will pipe the output of ls to another command named error. The | symbol is a pipe operator that redirects the standard output of one command to the standard input of another command. The error argument is the name of the command that receives the output of ls as its input. However, there is no such command named error in the Linux system, and the shell will report an error and exit.
NEW QUESTION # 41
Given the following input stream:
txt1.txt
atxt.txt
txtB.txt
Which of the following regular expressions turns this input stream into the following output stream?
txt1.bak.txt
atxt.bak.txt
txtB.bak.txt
- A. s/^.txt/.bak/
- B. s/txt$/bak.txt/
- C. s/[.txt]/.bak$1/
- D. s/^txt$/.bak^/
- E. s/txt/bak.txt/
Answer: B
Explanation:
The correct answer is C, s/txt$/bak.txt/. This regular expression will turn the input stream into the desired output stream by using the s command, which is used to substitute or replace a pattern with another pattern.
The syntax of the s command is:
s/pattern/replacement/
The pattern is the regular expression that matches the text to be replaced, and the replacement is the text that replaces the matched text. The / symbol is used as a delimiter to separate the pattern and the replacement, but other characters can be used as well.
The pattern in this regular expression is txt$, which means that it will match the string txt at the end of the line. The $ symbol is an anchor that matches the end of the line. The replacement in this regular expression is bak.txt, which means that it will replace the matched string with the string bak.txt.
Therefore, the command s/txt$/bak.txt/ will replace the string txt at the end of each line with the string bak.
txt, resulting in the following output stream:
txt1.bak.txt atxt.bak.txt txtB.bak.txt
The other regular expressions are incorrect for the following reasons:
* A, s/^.txt/.bak/: This regular expression will not work as expected, because it has several errors. First, the pattern in this regular expression is ^.txt, which means that it will match the string .txt at the beginning of the line. The ^ symbol is an anchor that matches the beginning of the line. However, none of the lines in the input stream start with .txt, so the pattern will not match anything. Second, the replacement in this regular expression is .bak, which means that it will replace the matched string with the string .bak. However, this will not produce the desired output, because it will not append the string .
txt to the end of the line, but rather replace the existing string with .bak.
* B, s/txt/bak.txt/: This regular expression will not work as expected, because it has several errors. First, the pattern in this regular expression is txt, which means that it will match the string txt anywhere in the line, not just at the end. This will cause unwanted replacements in the middle of the words, such as atxt and txtB. Second, the replacement in this regular expression is bak.txt, which means that it will replace the matched string with the string bak.txt. However, this will not produce the desired output, because it will not preserve the original string, but rather replace it with bak.txt.
* D, s/txt$/.bak/: This regular expression will not work as expected, because it has several errors. First, the pattern in this regular expression is ^txt$, which means that it will match the string txt only if it is the entire line. The ^ and $ symbols are anchors that match the beginning and the end of the line, respectively. However, none of the lines in the input stream are exactly txt, so the pattern will not match anything. Second, the replacement in this regular expression is .bak^, which means that it will replace the matched string with the string .bak^. However, this will not produce the desired output, because it will not append the string .txt to the end of the line, but rather replace the existing string with .bak^, which is not a valid file name.
* E, s/[.txt]/.bak$1/: This regular expression will not work as expected, because it has several errors.
First, the pattern in this regular expression is [.txt], which means that it will match any one of the characters inside the brackets, which are ., t, and x. This will cause unwanted replacements of single characters, such as the dot in the file extension or the letter t in the word atxt. Second, the replacement in this regular expression is .bak$1, which means that it will replace the matched character with the string .bak followed by the first backreference. A backreference is a way to refer to a part of the pattern that was captured by parentheses. However, there are no parentheses in the pattern, so the backreference
$1 is invalid and will not work. Third, the replacement in this regular expression will not produce the desired output, because it will not append the string .txt to the end of the line, but rather replace the existing character with .bak$1, which is not a valid file name.
:
How to Use Regular Expressions (regexes) on Linux - How-To Geek
How to Use Regular Expressions (RegEx) on Linux - GeeksforGeeks
A beginner's guide to regular expressions with grep - Red Hat Developer
[Regular Expressions - Linux Documentation Project]
[Regular Expressions in Linux Explained with Examples - Linux Handbook].
NEW QUESTION # 42
The command dbmaint & was used to run dbmaintin the background. However, dbmaintis terminated after logging out of the system. Which alternative dbmaintinvocation lets dbmaintcontinue to run even when the user running the program logs out?
- A. dbmaint &>/dev/pts/null
- B. wait dbmaint
- C. job -b dmaint
- D. nohup dbmaint &
- E. bg dbmaint
Answer: D
NEW QUESTION # 43
You are having some trouble with a disk partition and you need to do maintenance on this partition but your users home directories are on it and several are logged in.
Which command would disconnect the users and allow you to safely execute maintenance tasks?
- A. shutdown -r now
- B. /etc/rc.d/init.d/network stop
- C. killall -9 inetd
- D. /bin/netstop --maint
- E. telinit 1
Answer: E
NEW QUESTION # 44
While using the vi editor, you wish to move ahead one page. You should press the control key and:
- A. F
- B. A
- C. D
- D. U
Answer: A
NEW QUESTION # 45
When removing a package on a system using dpkg package management, which dpkgoption ensures configuration files are removed as well?
- A. --declare
- B. --remove
- C. --purge
- D. --clean
- E. --vacuum
Answer: C
NEW QUESTION # 46
Which of the following settings for umask ensures that new files have the default permissions -rw-r----- ?
- A. 0038
- B. 0017
- C. 0027
- D. 0640
Answer: C
Explanation:
Explanation
The correct setting for umask that ensures that new files have the default permissions -rw-r----- is 0027. The umask command sets or displays the file mode creation mask, which determines the permissions bits for newly created files or directories. The umask value is an octal number that represents the permissions that are not given to the files or directories. To calculate the umask value, we need to subtract the desired permissions from the maximum permissions, which are 666 for files and 777 for directories. For example, if we want the files to have the permissions -rw-r-----, which means read and write for the owner and read for the group, we need to subtract 640 from 666, which gives us 026. However, since the first digit of the umask value is for the special permissions, such as setuid, setgid, and sticky bit, we need to add a zero at the beginning to indicate that no special permissions are set. Therefore, the final umask value is 0026. The other options are incorrect because they do not produce the desired permissions. Option A gives the permissions -rw-rw----, which means read and write for the owner and the group. Option B is not a valid umask value, but the desired permissions in octal format. Option C gives the permissions -rw----r-, which means read and write for the owner and read for others. References:
* [LPI Linux Essentials - 1.3 Basic File Management]
* [LPI Linux Essentials - 2.1 Using Devices, Linux Filesystems, Filesystem Hierarchy Standard]
* [LPI Linux Essentials - 2.2 Mounting, Unmounting Filesystems]
* [LPI Linux Essentials - 2.3 Disk Partitions]
* Umask command in Linux with examples - GeeksforGeeks
* Umask Command in Linux | Linuxize
* Linux umask Command Explained - LinuxOPsys
* Shell Scripting - Umask Command - GeeksforGeeks
* umask Command - IBM
NEW QUESTION # 47
Creating a hard link to an ordinary file returns an error. What could be the reason for this?
- A. The source file is hidden.
- B. The source and the target are on different filesystems.
- C. The source file is read-only.
- D. The source file is already a hard link.
- E. The source file is a shell script.
Answer: B
Explanation:
Explanation
The most likely reason for getting an error when creating a hard link to an ordinary file is that the source and the target are on different filesystems. A hard link is a directory entry that points to the same inode as the original file. An inode is a data structure that stores the metadata and location of a file on a filesystem. A hard link cannot span across different filesystems because each filesystem has its own inode table and numbering scheme. Therefore, a hard link can only refer to a file that exists on the same filesystem as the link. This is mentioned in the article by How-To Geek1 and the man page of ln2. The other options are not valid reasons for getting an error when creating a hard link. The source file being hidden, read-only, or a shell script does not affect the ability to create a hard link, as long as the user has the appropriate permissions. The source file being already a hard link also does not prevent creating another hard link to the same file, as long as the maximum number of links per inode is not exceeded. This is explained in the article by Linuxize3 and the man page of ln
NEW QUESTION # 48
How do you get a list of files that have been installed from a dpkg package?
- A. dpkg -S pkgname
- B. dpkg -s pkgname
- C. dpkg-L pkgname
- D. dpkg -l pkgname
- E. dpkg -C pkgname
Answer: C
NEW QUESTION # 49
You have just set up the Gnome Display Manager as your default display manager. What file should you edit to change the default greeting for it?
- A. /etc/X11/gdm/lnit/Default
- B. /etc/X11/gdm.conf
- C. /etc/X11/XF86Config
- D. /etc/X11/prefdm
Answer: A
NEW QUESTION # 50
Which chown command will change the ownership to foo and the group to bar on a file named biglist?
- A. chown -u foo -g bar biglist
- B. chown --user foo --group bar biglist
- C. chown foo:bar biglist
- D. chownfoo/bar biglist
Answer: C
NEW QUESTION # 51
Which of the following apt-get subcommands installs the newest versions of all currently installed packages?
- A. dist-upgrade
- B. update
- C. auto-update
- D. install
- E. full-upgrade
Answer: A
Explanation:
The apt-get subcommand that installs the newest versions of all currently installed packages is dist-upgrade.
The dist-upgrade subcommand performs the same function as the upgrade subcommand, which is to install the latest versions of the packages that are already installed on the system, but it also intelligently handles the dependencies and removes the obsolete packages if necessary. The dist-upgrade subcommand is useful when upgrading the entire system to a new release or distribution12.
The other options are either invalid or do not perform the desired task. The auto-update subcommand does not exist, and the update subcommand only updates the list of available packages from the repositories, but does not install any packages. The full-upgrade subcommand is an alias for the dist-upgrade subcommand, so it performs the same function, but it is not the standard name for the subcommand. The install subcommand installs new packages or specific versions of packages, but it does not upgrade all the currently installed packages. References:
* Linux Essentials - Linux Professional Institute Certification Programs1
* Exam 101 Objectives - Linux Professional Institute2
* APT-GET Command in Linux {Detailed Tutorial With Examples} - phoenixNAP3
* How do I get help on apt-get's install subcommand?
* APT Cheat Sheet | Packagecloud Blog
NEW QUESTION # 52
Which of the following commands can be used to download the RPM package kernel without installing it?
- A. rpm --download --package kernel
- B. rpmdownload kernel
- C. yum download --no-install kernel
- D. yumdownloader kernel
Answer: D
NEW QUESTION # 53
Which of the following commands will change all CR-LF pairs in an imported text file, userlist.txt, to Linux standard LF characters and store it as newlist.txt?
- A. tr -c '\n\r' '' < newlist.txt > userlist.txt
- B. tr '\r\n' '' < userlist.txt > newlist.txt
- C. tr '\r' '\n' userlist.txt newlist.txt
- D. tr -s '^M' '^J' userlist.txt newlist.txt
- E. tr -d '\r' < userlist.txt > newlist.txt
Answer: E
Explanation:
The tr command is used to translate, squeeze, or delete characters from a file or a stream. The -d option is used to delete characters that appear in the first operand. The \r and \n are escape sequences that represent the carriage return and the line feed characters, respectively. The CR-LF pair is the standard line ending for Windows text files, while the LF character is the standard line ending for Linux text files. Therefore, the command tr -d '\r' < userlist.txt > newlist.txt will delete all the CR characters from the userlist.txt file and redirect the output to the newlist.txt file, effectively converting the line endings from Windows to Linux format. The other commands are incorrect because they either use the wrong syntax, the wrong operands, or the wrong redirection. References:
* LPI 101-500 Exam Objectives, Topic 103.7, Weight 4
* LPI Learning Materials, Chapter 3.7, Basic Scripting
* Web Search Results, 1
NEW QUESTION # 54
Which of the following Linux filesystems preallocates a fixed number of inodes at the filesystem's make/creation time and does NOT generate them as needed? (Choose TWO correct answers.)
- A. ext2
- B. XFS
- C. JFS
- D. procfs
- E. ext3
Answer: A,E
NEW QUESTION # 55
The _____________ command displays ISA plug-and-play devices resource information.
Answer:
Explanation:
pnpdump
NEW QUESTION # 56
What information can the lspci command display about the system hardware? (Choose THREE correct answers.)
- A. Ethernet MAC address
- B. System battery type
- C. Device IRQ settings
- D. PCI bus speed
- E. Device vendor identification
Answer: C,D,E
Explanation:
The lspci command can display information about the system hardware, such as:
* Device IRQ settings1: The lspci command can show the interrupt request (IRQ) number assigned to each device by using the -v option. The IRQ number indicates how the device communicates with the CPU.
* PCI bus speed2: The lspci command can show the speed of the PCI bus by using the -vv option. The speed is expressed in megahertz (MHz) or gigahertz (GHz) and indicates how fast the data can be transferred between the device and the bus.
* Device vendor identification3: The lspci command can show the name and identification number of the device vendor by using the -n or -nn option. The vendor identification helps to identify the manufacturer and model of the device.
1: https://www.man7.org/linux/man-pages/man8/lspci.8.html 2: https://phoenixnap.com/kb/lspci- command 3: https://en.wikipedia.org/wiki/Lspci
NEW QUESTION # 57
......
What is the duration, language, and format of LPIC-1 Linux Administrator , 101-500 Exam
- Validity Period : 5 years
- Language : English, German, Japanese, Portuguese, Spanish, Chinese (Simplified) and Chinese (Traditional)
- Number of questions : 60 questions
- Duration : 90 minutes
- Passing Score : 500 / 800
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