grep Command in Linux Standard Examples

grep command is your friend for searching mainly text. It searches a given file for lines containing a given string or words. The grep command should be one of the most used commands and you should get familiar with it. I’m doing the same. Below are some standard grep commands: Search for any instance of …

Setting Up Static IP on Ubuntu Server 20.04 LTS

Ubuntu Server 20.04 LTS uses the tricky Netplan for network configuration by default. Network configuration is a bit more tricky, but still good. The default Netplan network configuration file on Ubuntu 20.04 LTS server is /etc/netplan/00-installer-config.yaml. First, find the network interface name which you want to configure a static IP address with the following command: As …

Linux command line history tips

Many times I found myself typing history into the terminal and then copy/paste the command I was looking for. But, then I found the below tricks to help repeat that command faster and more efficiently. Use Control+R I found this to be the most beneficial for me. It will do a reverse search really fast! …

How to restart a service running in docker compose

I’m playing with docker-compose for a test Flask app. My docker-compose.yml looks like this: I noticed any change I made in my files within my templates folder did not take effect when I reloaded the browser locally at localhost:5000 So, I found that I can just restart the ‘www’ service defined on my docker-compose.yml file …

Connect to a remote MySQL database using Linux terminal

This is simple. After you setup a user with proper access rights run the below commands. # mysql -u yourUser -p -h <yourHostname or IP> A little explanation: -u tells mysql what your username -p tells mysql you have a password and will prompt you to enter it after you press enter -h tells mysql …

Restart sound service in Ubuntu

The other day my sound stopped working on Ubuntu 18.04 desktop. I have no clue why. The sound stopped working overnight for some reason. After some research I found the below command to restart the sound service on Ubuntu: pulseaudio -k && sudo alsa force-reload All works now! Give it a try and let me …

Minicom error “Device /dev/ttyS0 is locked”

Sometimes if the connection to a device via Minicom is lost, the next time you start Minicom you could see an error: Device /dev/ttyS0 is locked. The name /dev/ttyS0 may be different, depending on your COM port. To avoid this issue you should always shut down Minicom using CTRL+A keys and then the Q key. …

How to run Ansible when Python not installed on Ubuntu EC2

I started an Ubuntu EC2 the other day hoping to run Ansible on it and was surprised that Python was not installed. A requirement for Ansible to run on target machines is to have a modern version of Python. You can just run sudo apt install python but this is not ideal if you need …

GREP command overview

The grep command means Global Regular Expression Print. This Linux command is one of the most useful commands out there. Below are some basic examples: grep ‘word’ filenamegrep ‘word’ filename1 filename2 filename3grep ‘string1′ string2’ filenamecat filename | grep ‘something’command | grep ‘something’ Next example, you can search for the user ‘tom’ in the Linux passwd …