Sooner or later, every person who works with Ubuntu wonders – what version of Ubuntu do i have? It is especially important to know the version of Ubuntu that you are running if you want to install some software and need to choose which version of Ubuntu the installer should be downloaded for. From this […]
Tor Browser – Change Country IP Address
Many companies on the Internet allow to access their services from certain countries only. If you need to access a website that is blocked from your country – you can use a Tor Browser. By default, the Tor Browser picks random exit nodes from any country, but it can be configured to use the exit […]
Install Docker on Ubuntu-16.04
For ones, who want to build and run Docker containers on Ubuntu-16.04 – first of all it is required to install Docker itself. To install the latest version of Docker and to be able to upgrade it easily in future – it is recommended to install Docker from the official repository. In this guide i […]
YUM – Install Specific Version of Package
By default, yum installs the latest version of a package among the all versions available in enabled repositories. Often it is required to install not the latest one, but some specific version or downgrade the already installed package to an older version. In this note i show how to make yum list all available versions […]
Git – Delete Branch (Local or Remote)
Normally, when you start working on some new feature, you create a new branch from the default branch (usually called master) and work inside it. When the work is done – you merge your branch inside master and create a new one to work on the next feature. Regardless of whether you are working with […]
Telegram API: Send Message – Personal Notification Bot
How about to get a push notification when some long-running job in Linux is completed? Or how about to have a script in crontab that collects some data and periodically sends the reports to your mobile device? This tutorial describes how to create a personal notification bot, that can send messages from the Linux command-line […]
Linux PS Command: Get the Process Start Time and Date
The usual ps -ef or ps aux commands in Linux show the start time of the processes that have been started today. For the older processes they show the start date or the start year only, but not the start time. Don’t worry! The start time of the long-running processes in Linux is not lost […]
Linux: Compress PDF – Reduce PDF Size
A scanned document saved as PDF can be too large, that is not always good. For example, the large size of a PDF file won’t permit to send it by email because of the probable limitation on the maximum size of attachments. In Linux you can compress a PDF file from the command line without […]
HowTo: Split PDF File – Linux Command Line
Sometimes it is required to extract some pages from a PDF file and save them as another PDF document. In Linux we can easily split PDF documents by pages using the command line utility called pdftk. From this article you will learn how to extract individual pages or a range of pages from a PDF […]
SED – Find and Replace a String in a File
The substitution option is one of the most useful options of a sed command. In particular, it allows to search a text file for lines that contain particular string (SEARCH_STRING), word or match some regular expression and replace all occurrences of such lines with some REPLACEMENT_LINE. To replace the whole line using sed, it is […]