Technology Insights

SSH Add Server To known_hosts Automatically

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If you ever need to write a shell script that uses either SSH or SCP to unknown hosts then you will likely have run across the issue of adding the remote host/server to the known_hosts file when automating either of the two commands are called within the script. You can easily get around this either by modifying the client computers ssh_config file or by using the -o switch available for both SSH (Secure Shell) and SCP (Secure Copy). Below we show how to modify the ssh_config file as well as an example of using each with the -o switch.

Technology Insights

DDWRT: Why Is SSH Management Greyed Out On DD-WRT Administration Page

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Earlier when attempting to login to a DD-WRT router at my house I was unable to so I figured when I upgraded the software last night that is must have disabled SSH Management for some reason. I went into the web interface to turn SSH Management on but it was greyed out. Luckily the fix is easy but wanted to note it in an article in case others couldn’t find the location to turn SSH on in DDWRT.

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How To Install SCP and SSH On Windows 7 Using Cygwin

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I use Cygwin on Windows to make my Windows only computers as comfortable as possible to me. This comfort is provided by the Linux command line utilities that allow me to work. Cygwin provides a way for me to run these utilities from a Windows 7 command prompt. Two utilities that are really useful that are not installed with Cygwin by default are SCP (Secure Copy) and SSH (Secure Shell). Both of these utilities allow secure communication with remote computers. Below I describe adding them to an existing Cygwin Windows 7 installation.