Note_Tech

All technological notes.

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Linux - Fundamental

Linux - Fundamental

What is Linux

Linux
- An Operating System
- A Kernel
  - a layer between applications and physical hardwares.
- A FOSS(Free/Open Source Software)
  - the source is free, but the distribution, binary, and compile code are not free.
- Unix-like.
Kernel
- the core of Linux
- layer between hardware and applications.

WSL

WSL
- Windows Subsystem for Linux
- Alternative to creating Virtual Machines
- Multiple Linux Distros are available.
- Lightweight.
- Windows 10 or newer
- Virualization Settings Enabled in BIOS.
- Internet connection is required.
  - Default Linux Distro: Ubuntu LTS
Run Terminal as administrator
- Command to install WSL: wsl --install
  - input user and pwd
- relogin:
  - win search Ubuntu

Command	Desc
`wsl -l -o`	list available distro online
`wsl -l`	list all installed distro locally
`wsl --install`	Install default(Ubuntu) distro wsl
`wsl --install -d Debian`	Install Debian distro wsl
`wsl --unregister -d Debian`	remove Debian distro from wsl

When a distro is not on the online list, can search for and install the distro using Store
To completely uninstall distro, the uninstallation using Apps & features is required.

Version

LTS
- Long Term Support
- Released every 2 years
- Supported for 5 years
- releases are even numbered versions with a minor version of .04.
Version represents year and month
Developer Releases
- non LTS version
- released every 6 months
- Supported for just 9 months.

Help Commands

3 types of help commands

CMD	DESC
`help`	Provides information on built-in commands
`whatis command1 command2`	Display one-line manual page descriptions
`command -help`	Display all options of a command
`man command`	Display a completed manual page of a command