$ ls -lh ./posts

How to display only new results that did not exist in the previous grep run

I had one script which did a very basic job, grepping for the keyword ‘ERROR’ and printing the results to the console. It worked but i…

cat how-to-display-only-new-results-that-did-not-exist-in-the-previous-grep-run.md →

How to add swap space to Linux

One of the most common operations is to add swap space to a Linux machine, there are two ways, the first one is to create a swap partition…

cat how-to-add-swap-space-to-linux.md →

Linux: How to expand an ext4 filesystem online

In the older times to expand a file system you would need to unmount the filesystem and apply some commands typically using the parted…

cat linux-how-to-expand-an-ext4-filesystem-online.md →

Use curl to write dinfluxDB

In this article i will show you how to use curl a well known and trusted tool to write data to influxdb, probably now you are wondering…

cat use-curl-to-write-dinfluxdb.md →

Awk: how to change timestamp format of a column

Recently i had a task to convert a csv file with timestamps in one column from a format to another! i didn't want to use Python for this…

cat awk-how-to-change-timestamp-format-of-a-column.md →

Linux: How to delete files and directories older than a number of days

One very common task is to delete files and directories that are older than a number of days, this is what usually we do with backups and…

cat linux-how-to-delete-files-and-directories-older-than-a-number-of-days.md →

How to send email through sendgrid API using curl

Do you use sendgrid to send emails? if yes this article will help you to use curl to send emails through shell, lets see how!

cat how-to-send-email-through-sendgrid-api-using-curl.md →

Docker: syslog logging per container

In this article i will show you how to configure syslog logging per container, having logs organized in a <container-name>/<logfile>…

cat docker-syslog-logging-per-container.md →

Docker: How to configure and use a local docker registry

In this article I show you how to create and use your own local docker registry, the reasons to create your own registry are keep images…

cat docker-how-to-configure-and-use-a-local-docker-registry.md →

x509 certificate signed by unknown authority error, how to resolve it.

Recently i had a problem with a Docker installation, where i could not “pull” any image from a Docker registry, the error message when i…

cat x509-certificate-signed-by-unknown-authority-error-how-to-resolve-it.md →