Ubuntu on the art of simplicity

Smile every time you sudo

Thu, 18 Feb 2021 00:00:00 +0000

If you want your terminal prompt to look like this every time you sodo, please continue reading. note: i did on ubuntu so for other flavor, file path might be slightly different

step 1. download this amazing ascii art text and move to /etc/sudoers.d/sudoers.lecture

❯ curl -O https://caferock.org/chris/groot.txt
❯ sudo cp groot.txt /etc/sudoers.d/sudoers.lecture

step 2. edit /etc/sudoers (or /etc/sudoers.d/privacy)

Defaults lecture = always
Defaults lecture_file = /etc/sudoers.d/sudoers.lecture

Let’s see this magnificent art <3

# reset timestamp
❯ sudo -k 
# some sudo command
❯ sudo -l

Cheers!

Useful Ubuntu Keyboard Shortcuts

Sun, 08 Mar 2020 00:00:00 +0000

See Useful keyboard shortcuts

Addition to the above:

Super + Space: Change input keyboard
Ctl + Q: Close an application window
Super + ↑ : Maxmize the application window.
Super → or ← : Move the application window to left | right


Cheers!

Create and Extract tar.gz on Ubuntu

Wed, 07 Aug 2019 00:00:00 +0000

Create tar.gz archives

tar czf new-tar-file-name.tar.gz file-or-folder-to-archive

c - create new archive z - compress the archive using gzip f - use archive file

Extract archives

tar -xzf tar-file-name.tar.gz

x - extract the archive. z - uncompress the archive using gzip. f - use archive file.

Let’s do it.

I only want to compress 3 files. When I extract archive what I want to see is files in the directory.

$ tree file_dir/
file_dir/
├── file1.txt
├── file2.txt
└── file3.txt

$ cd file_dir
$ tar czf files.tar.gz .
tar: .: file changed as we read it

# moved files.tar.gz to different directory
$ tar -xzf files.tar.gz 
$ ls
file1.txt file2.txt file3.txt file_dir files.tar.gz

Cheers!

Install GraalVM and run ptyhon with debugger

Sun, 14 Apr 2019 00:00:00 +0000

What is GraalVM?

GraalVM is a high-performance, embeddable, polyglot virtual machine for running applications written in JavaScript, Python, Ruby, R, JVM-based languages like Java, Scala, Kotlin, and LLVM-based languages such as C and C++.

Here is the Official doc link

Hmm… Okay, I have to see it.

Let’s install

Below is the way I installed GraalVM Community Edition on Ubuntu 18.04. For other platform, the official doc installation guide is here.

# update this number to latest version from here: https://github.com/oracle/graal/releases
version=1.0.0-rc15
wget https://github.com/oracle/graal/releases/download/vm-${version}/graalvm-ce-${version}-linux-amd64.tar.gz
tar -xvzf graalvm-ce-${version}-linux-amd64.tar.gz
# clean up
rm graalvm-ce-${version}-linux-amd64.tar.gz
# to wherever you want. 
mv graalvm-ce-1.0.0-rc15/ ~/bin/graalvm
# if you want to make it permanent, put this in your bashrc 
export PATH=$HOME/graalvm/bin:$PATH

Now that your graalvm/bin in your path, you’ll get the GraalVM versions of those runtimes.

Install Python on Ubuntu

Mon, 15 Oct 2018 00:00:00 +0000

Check the latest version here At the time of writing, 3.8.0 is the latest and 3.8.5 has release candidate.

Also make sure you have sqlite3, libbz2-dev and libffi-dev are installed

sudo apt-get install libsqlite3-dev libbz2-dev libffi-dev

version=3.8.5
wget https://www.python.org/ftp/python/${version}/Python-${version}.tgz
tar xzvf Python-${version}.tgz
cd Python-${version}
# Linux (or any Unix-like system), the default prefix and exec-prefix are /usr/local.
# thus you should be able to omit --prefix here
# --enable-optimizations option for significant speed boost (10-20%) but much
# slower build process
./configure --prefix /usr/local --enable-optimizations
make
sudo make install
# OR if you want to skip creating the python link then:
sudo make altinstall

in case you want to remove and re-install it again cause some software was missing before installation

Fix screen resolution after 18.04 LTS upgrade on System 76

Tue, 05 Jun 2018 00:00:00 +0000

The problem:

Ubuntu prompt me that 18.04 LST is available so I clicked Upgrade to initiate upgrade. When upgrade is completed, the system was rebooted and came back with lowest screen resolution you can ever imagine.

Fix

In summary…. This is only good for System 76 system. Looks like driver update was necessary. Anyhow…

So upgrade was completed

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04 LTS
Release:	18.04
Codename:	bionic

and looks like I lost lsb module. so restoring that…

Upgrade vagrant to latest

Tue, 06 Feb 2018 00:00:00 +0000

The Problem:

I love vagrant. I am so dependent on testing my ansible before I run against mutable boxes. Yes, I’m still living in place where Ops provision VM and the box stays mutable. It is okay though… change should be coming. Anyhow, I installed vagnrat on my new Ubuntu machine (ubuntu-17.10) but the version was 1.9. It was working fine until I upgraded the box to debian/stretch64. It says that The box 'debian/stretch64' could not be found. And noticed that it was trying to look in the old repo https://atlas.hashicorp.com instead of this https://app.vagrantup.com.