Author Archives: Adam Mallul

About Adam Mallul

DevOps/IT Specialist, Musician. IT Manager - Faculty of Exact Sciences, Bar-Ilan University Personal Website

Linux ACL Permissions

Overview

“Access Control List (ACL) provides an additional, more flexible permission mechanism for file systems.
It is designed to assist with UNIX file permissions.
ACL allows you to give permissions for any user or group to any disc resource.” (Wikipedia)
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Test firewall with netcat

Overview

“The nc (or netcat) utility is used for just about anything under the sun involving TCP, UDP, or UNIX-domain sockets.
It can open TCP connections, send UDP packets, listen on arbitrary TCP and UDP ports, do port scanning, and deal with both IPv4 and IPv6. Unlike telnet nc scripts nicely, and separates error messages onto standard error instead of sending them to standard output, as telnet does with some.” (NetCat Manual)

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chmod suid sgid sticky bit

Overview

Linux chmod has a few options that can make your life a lot easier when managing a shared storage.
The most needed are chmod suid sgid sticky bit.
Also the impact of each one is different between files and folders.
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CentOS xrdp HowTo

Overview

xrdp is a free open-source remote desktop server for Linux.
Installing xrdp on CentOS might be a little tricky since CentOS repositories does not contain the xrdp package.
Even the EPEL repository (Extra Packages Enterprise Linux) only contains an old version of xrdp.
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iptables examples on CentOS

Overview

“iptables is a user space application program that allows a system administrator to configure the tables provided by the Linux kernel firewall (implemented as different Netfilter modules) and the chains and rules it stores.
Different kernel modules and programs are currently used for different protocols; iptables applies to IPv4, ip6tables to IPv6, arptables to ARP, and ebtables to Ethernet frames.”

In this tutorial I will give a few essential examples of how to use iptables on CentOS
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Warcraft 3 1920 HD resolutions

Overview

Warcraft 3 is one the best RTS games ever produced, released in 2002.
The only issue is that the new HD and Wide resolutions are not supported in the configuration menu.
In this tutorial I will show you how to add support for these resolutions.
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Unreal Tournament 99 1920 HD resolutions

Overview

Unreal Tournament 99 is an old shooter games but it is still one of the best arena games ever produced.
The community mods and skins support makes it even more enjoyable for most of us.
The only issue is that the new HD and Wide resolutions are not supported in the configuration menu.
In this tutorial I will show you how to add support for these resolutions.
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Disable Inactive Users in Active Directory

Overview

Disable all Active Directory users in a domain or a specified OU that have not logged on and were not created within X days and save the list to a csv file.
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VMware Onyx usage and examples

Overview

“Onyx is a standalone application that serves as a proxy between the vSphere Client and the vCenter Server. It monitors the network communication between them and translates it into an executable PowerShell code. Later, this code could be modified and saved into a reusable function or script.”
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