Mac For Unix Geeks

Mac OS X for Unix Geeks is the ideal survival guide to tame the Unix side of Leopard and Tiger. If you're a Unix geek with an interest in Mac OS X, you'll soon find that this book is invaluable. Enter your mobile number or email address below and we'll send you a link to download the free Kindle App. Oct 21, 2019 Unix was created fifty years ago at Bell Labs, a research and development company owned by AT&T. Fast-forward to 1973 and Version 4 of Unix, which was rewritten in the C programming language. This made the operating system much more portable and easier to transfer to different hardware platforms. Mac OS X for Unix Geeks serves as a bridge between Apple's Darwin OS and the more traditional Unix systems. This clear, concise guide gives you a tour of Mac OS X's Unix shell in both Leopard and Tiger, and helps you find the facilities that replace or correspond to standard Unix utilities. The book wraps up with a quick manpage-style reference to the 'Missing Manual Pages'-commands that come with Mac OS X although there are no manpages.If you find yourself disoriented by the new Mac environment, Mac OS X for Unix Geeks can help you acclimate yourself quickly to the familiar, yet foreign, Unix.

Nmap is Linux command-line tool for network exploration and security auditing. This tool is generally used by hackers and cybersecurity enthusiasts and even by network and system administrators. It is used for the following purposes:

  • Real time information of a network
  • Detailed information of all the IPs activated on your network
  • Number of ports open in a network
  • Provide the list of live hosts
  • Port, OS and Host scaning

Installing Nmap Command

In case of Debian/Ubuntu

In case of CentOS/RedHat

Working with Nmap Command

1. To scan a System with Hostname and IP address. First, Scan using Hostname

Now let’s Scan using IP Address

The nmap command allows scanning a system in various ways. In this we are performing a scan using the hostname as “geeksforgeeks” and IP address “”, to find all open ports, services, and MAC addresses on the system.

Mac os x for unix geeksMac

2. To scan using “-v” option.

It is used to get more detailed information about remote machine.

3. To scan multile hosts

Mac For Unix Geeks Operating System

We can scan multiple hosts by writing IP addresses or hostnames with nmap.

Mac For Unix Geeks Software

Mac For Unix Geeks

4. To scan whole subnet

We can scan a whole subnet or IP range with nmap by providing “*” with it. It will scan a whole subnet and give the information about those hosts which are Up in the Network.


5. To scan to detect firewall settings.

Detecting firewall settings can be useful during penetration testing and vulnerability scans. To detect it we use “-sA” option. This will provide you with information about firewall being active on the host. It uses an ACK scan to receive the information.

6. To identify Hostnames

We use “sL” option to find hostnames for the given host by completing a DNS query for each one. In addition to this “-n” command can be used to skip DNS resolution, while the “-R” command can be used to always resolve DNS.

7. To scan from a file

If we have a long list of addresses that we need to scan, we can directly import a file through the command line. It will produce a scan for the given IP addresses.

8. To get some help

We use the “-h” option if we have any questions about nmap or any of the given commands. It shows the help section for nmap command, including giving information regarding the available flags.

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Mac Os For Unix Geeks

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