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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 October 2016

Tracking Emails in Postfix Logs

October 27, 2016 – 6:02 pm
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Depending on your Postfix configuration, the same email may cycle through the postfix queue several times, changing it’s queue ID and making it difficult to track. For example, if you have Amavis configured for spam and …

Gather MX Records for a List of Domains

October 26, 2016 – 3:45 pm
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This is a simple one: get a list of MX records for the given domains and output into CSV file. Really, the only interesting part of this is the use of array to temporarily store …

Installing Alternative Java Versions on RHEL/CentOS

October 26, 2016 – 2:23 pm
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Below is shorthand for installing alternative versions of Java on your RHEL/CentOS system. This may come in useful for the purposes of testing.

Loan Payment Calculator in Bash

October 13, 2016 – 5:53 pm
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Just a little bit of fun with Bash: a loan payment calculator. Nothing fancy here. Maybe I’ll add the amortization schedule to it later…

Installing NetData on RHEL/CentOS

October 13, 2016 – 5:50 pm
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NetData is a real-time system monitor great for visualizing performance data. Instances of netdata run independently on monitored systems. The results can be accessed remotely and grouped into a single dashboard view, making this tool highly scalable. …