Running the command rm Downloads leads to the following error:
rm: cannot remove 'Downloads/': Is a directory
Which of the following commands can be used instead to remove Downloads, assuming Downloads is
empty? (Choose two correct answers.)
To remove a directory, you need to use a command that can delete directories, not just files. The rm command can only remove files by default, unless you use the -r option, which stands for recursive. This option tells rm to delete the directory and all of its contents, including subdirectories and files. The rmdir command can also remove directories, but only if they are empty. If the directory contains any files or subdirectories, rmdir will fail and display an error message. Therefore, the correct commands to remove Downloads, assuming it is empty, are rmdir Downloads and rm -r Downloads. The other commands are either invalid or do not work on directories.Reference:
Linux Essentials - Linux Professional Institute (LPI), section 2.3.1
LPI Linux Essentials Study Guide: Exam 010 v1.6, 3rd Edition, chapter 4, page 93.
What is true about links in a Linux file system?
A symbolic link, also known as a symlink or soft link, is a special type of file that points to another file or directory by its name. A symbolic link can point to a file or directory on the same or different file system, as long as the target is accessible. For example, you can create a symbolic link to a file on a USB drive or a network share, as long as the device is mounted or the connection is established. However, if the target of the symbolic link is moved, renamed, or deleted, the link becomes broken and does not work. To create a symbolic link, you can use the ln command with the -s or --symbolic option, followed by the target name and the link name. For example,ln -s /mnt/usb/file.txt link.txtcreates a symbolic link named link.txt that points to the file.txt on the USB drive mounted at /mnt/usb.
The other options are not true about links in a Linux file system. A symbolic link can point to a directory as well as a file. A hard link, which is a direct reference to the same data as another file, can only point to a file and not a directory. A hard link cannot span across different file systems, because it depends on the inode number, which is unique within a file system. When the target of the symbolic link is moved, the link is not automatically updated, but becomes broken. Any user can create hard links, as long as they have the permission to read and write the target file and the link directory.
Linux Essentials - Linux Professional Institute (LPI)
Ln Command in Linux (Create Symbolic Links) | Linuxize
Which of the following commands extracts the contents of the compressed archive file1.tar.gz?
The correct command to extract the contents of the compressed archive file1.tar.gz istar -xzf file1.tar.gz. This command uses the following options:
-xmeans extract files from an archive.
-zmeans filter the archive through gzip, which is a compression program that reduces the size of files.
-fmeans use the following archive file name, which is file1.tar.gz in this case.
The other commands are incorrect for the following reasons:
tar -czf file1.tar.gzcreates a compressed archive file1.tar.gz from the files specified after the command, not extract it.
ztar file1.tar.gzis not a valid command, as ztar is not a standard program or option for tar.
tar --extract file1.tar.gzis missing the-zoption to handle the gzip compression, and also the-foption to specify the file name.
detar file1.tar.gzis not a valid command, as detar is not a standard program or option for tar.
Linux Essentials - Topic 106: The Linux Operating System, section 106.2 Use single shell commands and one line command sequences to perform basic tasks on the command line.
LPI Linux Essentials Study Guide: Exam 010 v1.6, 3rd Edition, Chapter 5: Working with Files and Directories, section Compressing and Archiving Files.
Which of the following commands shows the absolute path to the current working directory?
The command pwd stands for ''print working directory''. It will print the absolute path of the current working directory to the terminal.For example, if we are currently in the /home/user/directory, it will print out that exact path1.The pwd command is useful for finding out where we are in the file system hierarchy and for verifying the location of files and directories2.
The other options are not commands that show the absolute path to the current working directory.The who command shows the users who are currently logged in to the system3.The cd ... command changes the current working directory to the parent directory of the current one2.The ls -l command lists the files and directories in the current working directory in a long format, which shows the permissions, ownership, size, date, and name of each file and directory2.The cd ~/home command changes the current working directory to the /home directory under the user's home directory, which may or may not exist2.Reference:
Linux Essentials Exam Objectives, Version 1.6, Topic 103.1, Weight 2
Linux Essentials Certification Guide, Chapter 3, Page 51-52
How to Get the current directory in Linux- howtouselinux
How To Find The Absolute Path Of A File Or Directory In Linux- systranbox
Reverse DNS assigns hostnames to IP addresses. How is the name of the IP address 198.51.100.165 stored
on a DNS server?
Reverse DNS lookups query DNS servers for a PTR (pointer) record; if the server does not have a PTR record, it cannot resolve a reverse lookup. PTR records store IP addresses with their segments reversed, and they append ''.in-addr.arpa'' to that. For example, if a domain has an IP address of 192.0.2.1, the PTR record will store the domain's information under 1.2.0.192.in-addr.arpa.In IPv6, the latest version of the Internet Protocol, PTR records are stored within the ''.ip6.arpa'' domain instead of '.in-addr.arpa.'1Therefore, the name of the IP address 198.51.100.165 is stored in the PTR record for 165.100.51.198.in-addr.arpa.Reference:1: Reverse DNS lookup - Wikipedia1
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