If you are in the middle of a text processing pipeline, and need to insert a shell or environment variable into the output of awk, you can use the “-v” flag. Here are two files containing animal classifications: $ echo -e “shark=fish\ndolphin=mammal” > ocean.txt $ echo -e “dog=mammal\neagle=bird” > land.txt By passing the loop variable … Bash: Using shell or environment variables in awk output
A common task when configuring software is modifying a properties file to set or override behavior. And although properties files are simple key=value pairs, there are some corner cases that make it challenging. For example, when setting a key/value pair, the key may be commented out with a hash mark in front of the line. … Bash: setting and replacing values in a properties file use sed
The sed utility is a powerful utility for doing text transformations. In this article, I will provide an example of how to insert a line before and after a match using sed, which is a common task for customizing configuration files. I have also written a related article on setting and replacing values in a … Linux: Using sed to insert lines before or after a match
ElasticSearch very often serves as a repository for monitoring, logging, and business data. As such, integrations with external system are a requirement. The Go programming language with its convenient deployment binary and rich set of packages can easily serve as a bridge between these systems and the ElasticSearch server. We will use the olivere/elastic package for this purpose, it is … ELK: Connecting to ElasticSearch with a Go client