Linux

The “rm -r dir_name” command removes the directory and all its content from Linux. The “rmdir” command will not delete non-empty directories.

To check the current version of WSL, the “wsl –list –verbose” or “wsl -l -v” command is utilized in the Windows Command Prompt.

To fix the “end of central directory signature not found” error, extract the zip file through an alternative utility or correct the path directory.

To fix the “unable to locate package openjdk 8 jdk” error, add the appropriate PPA repository, update the system and then run “sudo apt install openjdk-8-jdk”.

To fix the error “the repository does not have a release file”, remove and add the PPA again. After that, the installation of the package will be error-free.

The “ssh connection refused port 22” error can be resolved by installing “OpenSSH” packages or checking the active status of SSH services or port numbers.

To disable the services of IPv6 on the Ubuntu Linux system, the “sysctl” utility, GRUB bootloader, and GUI methods are provided.

In the Firefox browser, you can enable the dark mode through the “Default Theme”, “General Settings”, and “Firefox Color” extensions.

In Linux systems, SSH uses Port 22 that can visualize through the “getent” command, “systemctl” command, and “sshd_config” file

The “bash python command not found” error occurs when the python file cannot locate the system directory during execution.

In Linux, the “du”, “ls”, “stat” and “ncdu” commands are used to check the size of a file from the terminal requiring the file name.

Using the psql prompt, the “\l” and “\dt” command list all current/existing databases and tables in PostgreSQL. Read this post to learn more.

In Linux, the “php –version” or the “php -i” commands are used to check the installed version of PHP. You can also search for specific PHP versions.

The “tr” command is utilized to transform strings from standard input and display the output after performing operations(deleting, replacing characters, etc.).

To uninstall the applications on Ubuntu, use any of these, apt pkg manager, dpkg manager, snapd utility, and flatpak utility

To remove or delete the symbolic links in Linux, we can use the rm command utility, find, and unlink command utility. Read this post to learn more.

To list the ufw rules, run the command “sudo ufw status”. To delete the rules, use the “sudo ufw delete [port number]” or “sudo ufw delete [port number]”.

To check the PostgreSQL version using the terminal, run the command “ psql –version” in Linux terminal and use the command “SELECT version();” in the SQL shell.

To change the users’ password in Linux, use the commands “passwd” or “chpasswd” in the terminal or open the “Users” option in Settings using the GUI method

To open a text file in a Linux terminal, we can use the “cat”, “head”, “tail”, “more”, “less”, “nl”, and “xdg-open” commands and text editors, “nano” and “vim”.

To clear the terminal history in Linux, either run the “history -c” command or clear the history after each logout using “cat /dev/null > ~/.bash_history”.

To reverse a string in Python, the “string slicing”, “for” loop, “while” loop, “recursion” function, and “reversed()” function are used.

To install the Cisco WebEx on Linux distributions, download the Debian or RPM package of Webex and install it using the apt, yum, or dnf package managers.

To install a deb file in Ubuntu, either we can use the dpkg package manager with its “-i” option or the apt package manager with its “install” option.

To set or change the time zone in Linux, use the commands “tzselect”, and “sudo dpkg-reconfigure tzdata”, or by opening “Settings” of Linux

To copy files and directories in Linux, we can use the command-line interface using the cp command or the GUI method. For a detailed explanation, read this post.

The grep command can be used to find the words in the files of Linux. The words can be found in the current directory and its sub-directories.

In Linux, the purpose of the ifconfig command is to configure the network interfaces, specifically those associated with Kernel modules

The uname command is used in Linux to display the basic information of the computer, including kernel name, hostname, kernel version, and processor type.

GRUB is the abbreviation of GRand Unified Bootloader and is a bootloader and a boot manager. GRUB plays a key role in the Boot process.

To count files in directory, use the “ls [path] | wc -l”, “find [path] | -type f | wc -l”, “tree [path]”, and “rsync –stat –dry-run -a [path]” commands.

To update GRUB, open the terminal and execute the command “sudo update-grub”. GRUB must be updated to have a smooth performance of the system.

To set or change the hostname in Linux, use the command “sudo hostnamectl set-hostname [name]” or by changing the computer name in Sharing of Settings.

Linux distributions are mostly managed through the terminal. In the terminal, different commands are typed. … Read More

To clear apt-cache and reclaim precious disk space, use either “sudo apt clean -y” or “sudo apt autoclean -y” in Linux distributions.

First, install the VirtualBox on Linux, and download the Windows 10 iso. Then create a machine on VirtualBox and run it to install Windows 10

Run the command “systemctl list-units –type=service –state=running” or “service –status-all | grep ‘\[ + \]’” to check the running service on Linux.

The error “The following packages have unmet dependencies” is invoked if dependencies are broken, the repository is corrupted, or packages are held back

The “Unable to correct problems, you have held broken packages” occurs when apt repository isn’t updated, has broken dependencies, or the system holds packages.

The “sudo: no tty present and no askpass program specified” issue occurs when the sudo is used but password is not read. It is fixed by the NOPASSWD settings

The “mount point does not exist” issue is when declaring a mount point but the directory does not exist and is fixed by making that directory before mounting.

The “temporary failure resolving archive.ubuntu.com” issue occurs when the system has internet issues, or the DNS name server is missing.

The “python setup.py egg_info failed with error code 1” issue occurs when the setup tools, ez_setup are not installed or upgraded, including the pip installer.

There many methods to check the name of the shell, such as using the process ID or a few echo commands to check the shell in use.

The Microsoft ODBC driver is installed by downloading its key and config file and then installing the driver itself from the apt repository after the update

To execute the grep command to search through all the files in a directory, you need to navigate to the directory or enter the exact path and use the “*” sign.

The “package docker ce has no installation candidate” issue occurs when the Docker repository is not added. This error can be fixed by adding a repository.

The “failed to load module “canberra-gtk-module”” issue occurs when the GTK Module is missing and is fixed by installing the GTK Modules.

The error “export not a valid identifier” can be resolved by removing the spaces around “=” or naming the variable correctly.

The “No Bootable Medium Found” issue occurs when the optical disk is empty and is resolved by choosing the iso file of the operating system

To enable the VMware tools option, Remove the “CD/DVD” containing the ISO of guest machine. Now, set the other “CD/DVD” and “Floppy” disk to use physical drive

The “paths must precede expression: find” problem occurs due to the wrong syntax of find command and can be resolved by following the correct syntax and pattern.

To fix this, the Debian/Ubuntu users can use the command “sudo apt install python3-tk” and Fedore users can utilize “sudo dnf install python3-tkinter” command.

To verify if the Docker daemon is running, get the “status” or the “process Id” of the Docker daemon using “systemctl” and “pidof” commands.

The “sudo apt update” command is used to update the system repository. Using this command, the number of upgradeable packages is also provided.

The “cd” command is used in switching between various directories. It is used alongside the name of the directory to go up one directory.

The “modulenotfounderror no module named ‘django’” problem is invoked when the package is not installed on your system or installed globally.

The “Temporary failure in name resolution” issue occurs when the “resolve.conf” file is not configured or the ports “53” and “43” are blocked on your system.

In Linux, the “GCC” and “G++” compilers can be used to compile a C++ program using the name of the file to be compiled with the “lstdc++” option in “GCC”.

The “Laserjet MFP M130fn cannot scan” error occurs due to the missing driver “hplip” or a missing plugin “hp-plugin” and they can be installed using a terminal.

The error “kex_exchange_identification: Connection closed by remote host” occurs when the server’s connection with the receiver is interrupted.

The error “find: missing argument to exec” can occur due to incorrect syntax as well as when trying to deal with multiple arguments for “exec”.