Shodan is a search engine that lets the user find specific types of computers (routers, servers, etc.) connected to the internet using a variety of filters. Some have also described it as a search engine of service banners, which are meta-data the server sends back to the client.[1] This can be information about the server software, what options the service supports, a welcome message or anything else that the client can find out before interacting with the server.

Shodan collects data mostly on web servers (HTTP, port 80), as well as FTP (port 21), SSH (port 22) Telnet (port 23), SNMP (port 161), SIP (port 5060),[2] and Real Time Streaming Protocol (RTSP, port 554). The latter can be used to access webcams and their video stream.[3]

Test Internet connection speed with iperf in Linux

How do I test my Internet connection download speed from the console over the ssh session without using HTML5 or Adobe flash/Java applets based websites? How do I test my upload speed from the console?

You can use iperf utility for Linux – see iPerf3 is a tool for active measurements of the maximum achievable bandwidth on IP networks. It supports tuning of various parameters related to timing, buffers and protocols (TCP, UDP, SCTP with IPv4 and IPv6). For each test it reports the bandwidth, loss, and other parameters. This is a new implementation that shares no code with the original iPerf and also is not backwards compatible. iPerf was orginally developed by NLANR/DAST. iPerf3 is principally developed by ESnet / Lawrence Berkeley National Laboratory. It is released under a three-clause BSD license.

See tutorial at Nixcraft site


Linux Dash

A simple web dashboard to monitor your linux systems.


  • A beautiful, simple web-based dashboard for monitoring a linux server
  • Only ~1MB on disk! (.git removed)
  • Live graphs, refresh-able widgets, and a growing # of supported modules
  • Drop-in installation for PHP, Node.js, Python, and Go

More details and downloads:


Email Checker

Email Checker is a simple tool for verifying an email address. It’s free and quite easy to use. Just enter the email address and hit check button. Then it tells you whether the email address is real or not. It extracts the MX records from the email address and connect to mail server (over SMTP and also simulates sending a message) to make sure the mailbox really exist for that user/address. Some mail servers do not co-operate in the process, in such cases, the result of this email verification tool may not be accurate as expected.


Boot-Repair Utility and Methods

Boot-Repair is a simple tool to repair frequent boot issues you may encounter in Ubuntu like when you can’t boot Ubuntu after installing Windows or another Linux distribution, or when you can’t boot Windows after installing Ubuntu, or when GRUB is not displayed anymore, some upgrade breaks GRUB, etc.

Boot-Repair lets you fix these issues with a simple click, which (generally reinstalls GRUB and) restores access to the operating systems you had installed before the issue.

Boot-Repair also has advanced options to back up table partitions, back up bootsectors, create a Boot-Info (to get help by email or forum), or change the default repair parameters: configure GRUB, add kernel options (acpi=off …), purge GRUB, change the default OS, restore a Windows-compatible MBR, repair a broken filesystem, specify the disk where GRUB should be installed, etc.

More Information and link:


Linux – Copy file to multiple dir

How an I copy a file into multiple directories? You could write a script or just use these commands from the terminal in bash.

Copy test.txt into dir1,dir2,an dir3 dirs:

 echo dir1 dir2 dir3 | xargs -n 1 cp -v test.txt 

Copy test.txt into /dir/d1, /dir/d2, and /dir/d3 dirs:

 echo /dir/d{1,2,3} | xargs -n 1 cp -v test.txt