Category Archives: Linux

Mount a Windows Shared Folder on Ubuntu 12.04 within VirtualBox

In today’s post, I will show you have to mount a Windows shared folder in Ubuntu 12.04 from within VirtualBox. A prerequisite is that you have to have VirtualBox Guest Additions already installed. If you haven’t done so and would like to know how, read this previous post where I show you how. Otherwise, continue reading and I’ll show you how to mount a shared folder.

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Regular Expression Cheatsheet

Here’s a quick cheatsheet of the metacharacters used in regular expressions.

Metacharacter
Name
Matches
.dotany one character
[ ... ]character classany character listed
[^...]negated character classany character not listed
^caretthe position at the start of the line
$dollarthe position at the end of the line
\<backslash less-thanthe position at the start of the word
\>backslash greater-thanthe position at the end of the word
|or, barmatches either expression it separates
( ... )parenthesesused to limit scope of |
?question markone allowed; none required ("one optional")
*asteriskunlimited allowed; none required ("any amount OK")
+plusunlimited allowed; one required ("at least one")
\1, \2, ...back referencematches text previously matched within first, second, etc., set of parentheses
\backslashescape a metacharacter to match literally
{ ... }bracesInterval; counting quantifier; specify number of matches

How to install VirtualBox Guest Additions in Ubuntu 12.04

This is a step-by-step tutorial on how to install the Guest Additions on a VirtualBox Virtual Machine installed with Ubuntu 12.04 so that you can access a shared directory on the host computer. I initially tried to install the Guest Additions by selecting the “Install Guest Additions…” menu option under the Devices menu. Unfortunately, this didn’t work, and I’m not entirely sure why. So here are the steps that I took to get the Guest Additions successfully installed on my virtual machine.

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Understanding UMASK with Linux and Samba

Have you ever been confused with the Linux environment UMASK? How about trying to setup permissions with a Samba file server? Displaying and setting the umask for both the Linux environment and a Samba server is very easy. In this article, I’ll explain what a UMASK is and how to display and change the current value. Afterwards, I’ll explain UMASK in the context of using a Samba File server.

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