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Awk & sed Snippets for SysAdmins

March 2, 2022 – 2:00 pm

Books have been written on the subject of awk and sed. Here’s a small sample of commands I put together over the years that are useful for everyday system administration tasks. Most of these tasks …

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Article Archive for August 2011

Red Hat: Changing Hostname and IP

August 31, 2011 – 1:47 pm

Changing hostname and IP is frequently required when a server is being moved from testing or development to production. The process is a fairly simple one, but steps must be performed in a certain order to avoid complications.

Using Expect with SSH and Su

August 29, 2011 – 10:47 am

We have discussed using expect with sudo in an SSH session. Another common way to run commands on remote servers as root is to use the su – root command, where sudo is not configured. The trick to automating su operations using expect is to launch the su command with the spawn ssh command.

Enable Foreign Keyboard on iPhone

August 16, 2011 – 1:38 pm

This is a simple one, but people are always asking: how do I type in Russian, Swedish, Spanish, whatever on my iPhone? Go to Settings -> General -> International -> Keyboards -> Add New Keyboard -> select your language -> select Hardware Keyboard Layout (if applicable).

Moving Average with Excel and Shell Script

August 11, 2011 – 12:41 pm

In this example we will show you how to calculate simple moving average using Excel and a shell script. As more data is added to the file, the shell script and the Excel formula will automatically use the specified number of the latest data points to calculate the moving average.