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Changing the timezone on a Ubuntu/Debian server can be done using the following command: su dpkg-reconfigure tzdata

The following command will disable the date/time synchronization for a Guest operating system. Assuming the host is running Windows OS. Open the command prompt. (Run -> cmd) Enter command: C:\Users\User>”c:\Program Files\Oracle\VirtualBox\VBoxManage.exe” setextradata ENTER_MACHINE_NAME_HERE “VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled” “1″ * Replace ENTER_MACHINE_NAME_HERE with Guest system name * This command will add an extra line to the “C:\Users\User\VirtualBox VMs\MACHINE_NAME\MACHINE_NAME.vbox” file. [...]

If your user is not in the sudoers file you won’t be able to do any root tasks. To fix this: 1. Boot into the recovery mode and load the root console. (Hold left shift on boot to show the Grub loader) 2. To make the file system writable execute: mount -o remount,rw / 3. [...]

Uploading/Downloading files through your *nix console. Connection: $ sftp [email protected] Available commands: ls list files pwd show which directory you are in on the server side lpwd show which directory you are in on the client side cd DIRECTORY change current location to DIRECTORY on the server side lcd DIRECTORY change current location to DIRECTORY [...]

File and Folder permissions on *unix like systems.

Vi is a Unix/Linux terminal based text editor. Despite its overhelming features it is still popular among Unix administrators. I’ll mention some of the most used commands.