Getting the sum of a list of numbers is a common scenario on the command line, whether you are checking local filesystem utilization or parsing infrastructure reports for total cpu counts. There are multiple ways this can be done, but one of the simplest is to use awk. Let’s use a a sequence of numbers … Bash: calculate sum from a list of numbers
Docker can build multi-platform images that use a manifest index (fat manifest list) by using the Docker buildx command with backing containerd runtime and QEMU for cross-platform emulation. Using a manifest index for multi-platform images simplifies application level orchestration by using the same name and version for all architectures. For example: # same image name … Docker: building multi-platform images that use fat manifest list/index
If you have a complex JSON data structure or perhaps an array of rich data structures as the result of module output, you may want to extract this into a workable list or dictionary you can take action on. For this article, I will emulate the resulting output from the ‘stat‘ module when it checks … Ansible: extracting a list or dictionary from a complex data structure
As with any programming language, Python has a multitude of ways to accomplish the same task. In this article, I will explore the idea of taking a string and checking if it ‘startswith’ any of the strings from a predetermined list. As context for the example code, RFC1918 sets out several IPv4 ranges that can … Python: exploring the use of startswith against a list: tuple, regex, list comprehension, lambda
If you are working in a gcp project where the VPC networks are homed within the project itself, then specifying a subnet in gcloud calls is simple, just use the name of the subnet (e.g. ‘default’). However, if you are working in a gcp project where the VPC networks are shared (not owned) with the … GCP: retrieving the full subnet qualification from a shared VPC network
Finding the most recently modified files in a directory can be extremely beneficial when you have been making changes in files throughout the directory structure as part of a work effort, and now need to go back and pinpoint everything that was changed. This command will provide you the 10 most recently modified files, excluding … Bash: deep listing the most recently modified files in a directory
Python list comprehension provides a concise and pythonic way of generating lists. It allows you to select a subset based on a filter and apply a function to each element. Because although navigating every list entry, filtering certain records, and applying functions to specific fields is doable using basic ‘for’ statements, ‘if’ logic, and temporary … Python: Examples of list comprehension