Linux Objetive Question and Answer

Reference
How to shut down or reboot Ubuntu from terminal
How to restart Apache server on Ubuntu
How to start stop MySQL server on Ubuntu
How to change current working directory in Ubuntu terminal
How to rename a directory via command line in Ubuntu
How to copy the contents of a folder to another folder from terminal in Ubuntu
How to install updates via command line on Ubuntu
How to delete a non empty directory from terminal in Ubuntu
How to get a list of all installed packages on Ubuntu
How to completely remove a package or application in Ubuntu
How to unzip a zip file from the terminal in Ubuntu
How to save terminal output of a command to a file in Ubuntu
How to search for available packages from the command line in Ubuntu
How to find and replace text within a file using command line in Ubuntu
How to get the size of a directory from the command line in Ubuntu
How to open a text file in terminal in Ubuntu
How to remove all files from a directory using command line in Ubuntu
How to find the amount of free disk space in Ubuntu
How to create an empty file from command line in Ubuntu
How to check the current version of Ubuntu from the command line
How to append multiple lines to a file from terminal in Ubuntu
How to zip all files in a directory using command line in Ubuntu
How to extract a .tar.gz file using command line in Ubuntu
How to make ls command to show file sizes in megabytes in Ubuntu
How to find a file by name using command line in Ubuntu