Helpful Midnight Commander escape key sequences when function keys are not working

Running Midnight Commander on a Linux machine remotely that does not have function key support or not easy to access like mobile phones can be challenging. Generally, Linux console supports escape sequences, for example to simulate F1, press ESC+1 (press escape key, then press 1). Below shows convenient list of escape sequences for Midnight Commander

Action	Shortcut	Escape Sequence (⎋ symbol)
Close application	F10	⎋+0
User Menu	F2	⎋+2
Application Menu	F9	⎋+9

Shutdown Ubuntu from the command line

$: sudo shutdown -h now

Show apt package description from the command line

$: apt show ssh

This will show package description for ssh.

Show listening ports in Ubuntu using netstat

$: sudo netstat -tulpn

Install EF Core 3.1 Preview 3 in Ubuntu

To install Entity Framework Core 3.1.x Preview 3, do:

$: dotnet tool install --global dotnet-ef --version 3.1.0-preview3.19554.8
$: export DOTNET_ROOT=$HOME/.dotnet

Note that I am using local install of .Net Core 3.1 Preview 3 hence the need to export DOTNET_ROOT.

Install .Net Core 3.1 preview 3 in Ubuntu

$: cd ~/
$: mkdir tmp
$: cd tmp
$: wget https://dotnetwebsite.azurewebsites.net/download/dotnet-core/scripts/v1/dotnet-install.sh
$: chmod +x dotnet-install.sh
$: ./dotnet-install.sh -Version 3.1.100-preview3-014645
$: export PATH="$HOME/.dotnet:$PATH"

Install Chromium browser in Ubuntu

Chromium is the free and open source web browser developed by Google. To install it in Ubuntu do:

$: sudo apt install chromium-browser

Free math applications

List of free math applications:

Maxima - computer algebra system (link)
GNU Octave is a high-level language, primarily intended for numerical computations (link)
Python + scipy + matplotlib + ipython + pylab - python based numerical package (link - various )
R - a language and environment for statistical computing and graphics (link)
Sage (link)
Scilab -  is an open source, cross-platform numerical computational package and a high-level, numerically oriented programming language(link)

HowTo: Get Ubuntu version from the command line

Method 1

$: cat /etc/os-release | grep PRETTY_NAME

Method 2

$: cat /etc/issue

Method 3

$: lsb_release -d -s