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To set the manual date and time of the system, use the “date”, “timedatectl”, “hwclock”, and “ntpdate” commands and the “Date &Time” option via GUI.

The “LD_LIBRARY_PATH” environment variable searches the directories of the shared libraries. It can also be set in Linux using the “export” command.

The sshd Logs are stored in the “/var/log/auth.log” file. These log details can be displayed using the “grep”, “lastlog”, and the “journalctl” commands.

In Linux and its distributions, the user can easily create the home directory for an existing user with the help of the “mkdirhome_helper” command.

In Linux, the “sort” command line utility is used with the “-k” flag to perform the sorting operation based on the third column.

To trim the leading and trailing whitespaces from each line in the output of a file/script, use the Linux pre-installed “sed” and “awk” command line tools.

In Linux, the pre-installed “xrandr” command offers the “newmode” and the “addmode” flags to set the custom resolution of the system monitor.

To convert epoch timestamp to human-readable format use the “date” command, “awk” having starftime format, and the “localtime()” with the “echo” command.

To color diff output use the “diff –color” command for the newer version of “diff” and the “colordiff” command line tool for the older versions.

In Ubuntu, the “clean”, “autoclean”, and “autoremove” commands clean up the system cache, additional dependencies, and outdated versions of packages.

To add new lines, use the “-e(backspace interpreter)” and “$(bash variable)” with the “echo” command. An “echo” tool can also be used multiple times to do this.

In Linux and its distributions, the “curl” can be installed via default package managers i.e “apt” (Ubuntu/Debian), “yum” (CentOS/RHEL), and “dnf” (Fedora).

To generate a strong password, use the “urandom”, “makepasswd”, “gpg”, “apg”, “pwgen”, and “openssl rand” commands. It can also be done using the “Perl” script.

The “cd -” and “cd ~-” jump into the recently used directory but the “cd -” also prints that directory’s absolute path in the terminal.

Use the “for” and “while” loops in the shell script to read the file content line by line. Both these loops provide simple syntax to perform this task easily.

Linux offers the “systemctl” and “service” commands to restart the “SSH” service instantly. It can also be restarted by accessing the “/etc/init.d” directory.

In Linux, use the default package managers of Linux distribution, i.e., “apt(Ubuntu/Debian)” and “dnf(Fedora/CentOS/RHEL)” to completely remove the Virtualbox.

To change an IP address, utilize the “ip”, “ifconfig”, and the “nmcli” command line tools or the “Network” window in the GUI method.

In Linux, the “for” loop executes the block of statements repeatedly for every item in a list. It offers two types of syntax, i.e., “generalized” and “one line”.

Linux and its distributions offer the pre-installed “id”, “echo”, “lslogin”, and “getent” command line utilities for finding user ID from the terminal.

Linux offers the pre-installed “cp” and “rsync” commands to copy multiple specific files from source to destination. Read this article for more details.

The default LibreOffice look and feel can be customized to change its “User Interface”, “Toolbar Look”, “Menu Content”, “Icon Style” and “Theme and Colors”

The Linux distributions that support the gnome-desktop environment come with the “System Monitor” tool as a task manager by default.

On Linux and its major distros, “NodeJS” can be installed using “Default Repository”, “Node Source Repository”, and the “Node Version Manager”.

Linux and its distributions offer the pre-installed “systemctl” and “service” command line tools to restart the “Samba” server instantly.

In Linux, “java” can be completely uninstalled using their default package managers followed by the associated “remove” and “purge” flags.

In Linux, shell scripts use an essential component backtick or backquote that assigns the shell command output to the created variable.

Linux and its distributions offer the “getent”, “groupmems”, “members”, and “libuser_lid” command line utilities for listing the group members of a group.

To execute the “sudo” command without a password append the “Sudoers” file by adding “username ALL=(ALL) NOPASSWD:ALL” password configuration.

In Linux, Hard Disk Drives partitions can be viewed using “fdisk”, “cfdisk”, “lsblk”, and “parted” command line utilities or the “Disks” application.

In Linux, the “echo”, “ps”, “lsof”, and “readlink” commands become handy to check the shell. The “/etc/passwd” file also provides valid login shells.

Linux and its distributions come with a pre-installed “tar” command to create tar, untar and view the tar file content. Read this guide for more details.

Linux server can be rebooted using the “reboot”, “systemctl”, and “shutdown” command line utilities. For more details, read this guide.

The “atool” command line tool manages the archives of different formats like “jar”, “bzip”, tar.7z, gzip, and many others. Read this post for more details.

In Linux, use the “history” and “wipe” command line tools to delete the system history without a trace. Both of them completely wiped out the system’s history.

In Linux, to close the Vi – Vim / Vi editor, enter the “:q”; to save the file, type the “:w” and exit the editor without saving using “:q!” commands.

To exit the vim editor in Linux, use the “:q”, “:q!”, “:conf q”, “:wq”, and “:x” commands. The “:qa”, “qa!”, “wqa”, and “cq” are also used to perform this task.

Linux, the “ls (list)”, “find”, and “du(disk usage)” commands can be used to find large files. These commands also contain important supported options.

In Linux, create the backup of the MySQL databases and restore them by utilizing the built-in “mysqldump” command line tool.

To fix the error, the error “local.error: unsupported locale setting” can be fixed by adding the environment either temporarily or permanently.

In Linux, the VMware workstation is removed by the “vmware installer” Script. Furthermore, it can also be removed manually from the system.

An error “sed unknown option to ‘s’” occurs while searching a file name that contains slashes. To fix it, you need to use the “pipe” as a delimiter.