From Microsoft documentation: The Test-NetConnection cmdlet displays diagnostic information for a connection. It supports ping tests, TCP tests, route tracing, and route selection diagnostics. Depending on the input parameters, the output can include the DNS lookup results, a list of IP interfaces, IPsec rules, route/source address selection results, and/or confirmation of connection establishment.

To mimic the Telnet command one can use:

Test-NetConnection -ComputerName <HOSTNAME OR IP> -InformationLevel "Detailed" -Port <DESTINATION PORT>

Test ping connectivity with detailed results

How to add contents to a file

To add contents to a file we can use the Add-Content cmdlet.

Add-Content -Path C:\path_to_destination_file "Content to be added"

How to add the contents of a file to another file

To get a file contents we can use the Get-Content cmdlet.

Docker commands

In the article DOCKER 101, I wrote about the basics of Docker and its components. In this article I will cover a set o Docker basic commands very useful for any kind of usage.

Docker command line structure

The old way:

docker <command> (options)

The new recommended way:

Introduction

The purpose of this article is to give you a basic understanding of Docker, its components, and how it can be used to improve the development and deployment of applications.

Docker is a platform for developing, shipping and running applications. It provides a way to package applications and their dependencies into a lightweight, portable container that can run on any infrastructure. Docker has become increasingly popular in recent years due to its ability to streamline the development process, increase deployment efficiency, and improve collaboration between teams.

List files within gzip

How to list the files within a compressed gzip file without extracting it and get information like the timestamp and permissions?

To achieve this, we can use a tool called zcat.

Looking to its help session we can see:

zcat --help
Usage: /usr/bin/zcat [OPTION]... [FILE]...
Uncompress FILEs to standard output.

-f, --force       force; read compressed data even from a terminal
-l, --list        list compressed file contents
-q, --quiet       suppress all warnings
-r, --recursive   operate recursively on directories
-S, --suffix=SUF  use suffix SUF on compressed files
--synchronous     synchronous output (safer if system crashes, but slower)
-t, --test        test compressed file integrity
-v, --verbose     verbose mode
--help            display this help and exit
--version         display version information and exit

With no FILE, or when FILE is -, read standard input.

Report bugs to <bug-gzip@gnu.org>.

Understanding the option -l

The option we need is -l to list compressed file contents.

Find files by age

A while ago I needed to find old files in a Linux server. The find utility have the -mtime option to complete this task.

Here’s an example command:

find /path/to/directory -type f -mtime +730

Running this command will list all the files in the specified directory (and its subdirectories) that are older than two years.