Linux

Socket

Run Docker as normal user on Ubuntu 20.04

bin vs sbin

5 Ways to Keep Remote SSH Sessions and Processes Running After Disconnection

COUNT JSON ARRAY ELEMENTS WITH JQ

Reference: https://phpfog.com/count-json-array-elements-with-jq/

generating frequency table from file

sort -n input.txt | uniq -c

How to reset WSL2 Linux distro on Windows 10

  1. Open Start. 2/ Search for Command Prompt, right-click the top result, and select the Run as administrator option.
  2. Type the following command to view a list of all available distros and press Enter: wsl --list. Quick tip: You can also write the command like this: wsl -l.
  3. Type the following command to set a distro as the new default and press Enter: wsl --unregister DISTRO-NAME. In the command, replace DISTRO-NAME for the name of the distro you want to set as default (see step No. 3). For example, this command unregisters Kali Linux: wsl --unregister Kali-linux
  4. Type the following command to confirm distros and press Enter: wsl --list

Source: https://pureinfotech.com/reset-wsl2-linux-distro-windows-10/

JournalCtl

Whoami

Get absolute path of a file

realpath <FILENAME/DIRNAME>

How to Grow an ext2/3/4 File System with resize2fs

How to generate SSH key pairs

Guide to Linux jq Command for JSON Processing

jq playground

jq - Get last element from array

Install Docker on linux

Any distribution of architecture as easy as possible.

# Install docker latest version from original website
curl -fsSL https://get.docker.com/ | sh

# Adding your user to the "docker" group
sudo usermod -aG docker $(whoami)
## you will have to log out and back in for this to take effect!

# Start the docker daemon at boot
sudo chkconfig docker on
# or
sudo systemctl enable docker

# Check everything is okay
docker info
docker run hello-world

# If you have error in connect to docker daemon
## Restart Docker deamon
sudo service docker restart
## Or reboot! :D
sudo reboot

Install Docker Compose

Go to the Compose repository release page on GitHub and find latest version.

curl -L https://github.com/docker/compose/releases/download/1.10.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose

Source: AliMD/install-doceker.md

How to fix docker: Got permission denied while trying to connect to the Docker daemon socket

sudo chmod 666 /var/run/docker.sock (don’t use - not secure)

sudo usermod -aG docker ubuntu

Remote development in WSL - VSCode

Make sure to install Python extension for WSL inside VSCode.

How to permanently export a variable in Linux?

You have to edit three files to set a permanent environment variable as follow:

  • ~/.bashrc When you open any terminal window this file will be run. Therefore, if you wish to have a permanent environment variable in all of your terminal windows you have to add the following line at the end of this file: export DISPLAY=0
  • ~/.profile Same as bashrc you have to put the mentioned command line at the end of this file to have your environment variable in every login of your OS.
  • /etc/environment If you want your environment variable in every window or application (not just terminal window) you have to edit this file. Add the following command at the end of this file:

DISPLAY=0

Note that in this file you do not have to write export command

Normally you have to restart your computer to apply these changes. But you can apply changes in bashrc and profile by these commands:

$ source ~/.bashrc
$ source ~/.profile

But for /etc/environment you have no choice but restarting (as far as I know)

Source: https://stackoverflow.com/questions/13046624/how-to-permanently-export-a-variable-in-linux

Get ubuntu version from command line 

lsb_release -a

How to Ping Specific Port Number in Linux and Windows

https://phoenixnap.com/kb/ping-specific-port

How to configure the Windows Firewall to allow only specific IP Address to connect your ports?

https://manage.accuwebhosting.com/knowledgebase/2984/How-to-configure-the-Windows-Firewall-to-allow-only-specific-IP-Address-to-connect-your-ports.html

How to see if Windows Firewall is blocking a port or program

https://help.mashme.io/support/solutions/articles/29000036898-how-to-see-if-windows-firewall-is-blocking-a-port-or-program

Install xdg-utils

https://installati.one/ubuntu/20.04/xdg-utils/

pass in linux

  • https://linuxhint.com/pass-ubuntu/
  • https://linuxhint.com/pass-ubuntu/

hash -r

The hash -r command removes the cache.

How to manage Linux passwords with the pass command

  • https://www.redhat.com/sysadmin/management-password-store

YubiKey Setup Guide

Chezmoi - store state of dotfiles

  • https://www.chezmoi.io/quick-start/

GPG

rsync – a fast, versatile, remote (and local) file-copying tool

  • https://linux.die.net/man/1/rsync

Monday 

#monday
date -dmonday +%Y%m%d

#last monday
date -dlast-monday +%Y%m%d

#next monday
date -dnext-monday +%Y%m%d

#two mondays from now
date -d'monday+14 days' +%Y%m%d

#two mondays ago
date -d'monday-14 days' +%Y%m%d

#although, if you fancy yourself an Abraham Lincolin
date -d'monday-fortnight ago' +%Y%m%d #2 weeks ago
date -d'monday+fortnight' +%Y%m%d #2 weeks from now

#Monday Next Year
date -d'52+monday' +%Y%m%d

#However, Monday Last Year
date -d'52-monday' +%Y%m%d  #DOES NOT  WORK

https://stackoverflow.com/questions/6497525/print-date-for-the-monday-of-the-current-week-in-bash

Generate md5 checksums for all csv files in current directory

for F in *csv; do md5sum --text $F > ${F}.md5; done

Can’t execute conda activate from bash script #7980

Functions are not exported by default to be made available in subshells. I’d recommend you do:

source ~/anaconda3/etc/profile.d/conda.sh
conda activate my_env
  • https://github.com/conda/conda/issues/7980