====== Linux ======

===== Users and Groups =====

Linux is a multi-user operating system.  Different users and groups of users can be assigned permissions to handle certain files or run certain commands. \\
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//root// is a special user on Linux. root is a super-user account that can see all files and has permissions to run all commands.  Normally this account should only be used for administrative tasks.\\
root is automatically created when a Linux system is installed.\\
It's best practice to set up secondary user accounts and give those user accounts required permissions to perform their tasks.    https://docs.rackspace.com/support/how-to/linux-server-security-best-practices/
===== File System =====

The Linux file system is organised into files and directories.  Directories are basically like folders. \\
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Linux has standard directories for typical uses:

  * /bin  - binaries
  * /etc  - "et-see", system configuration files (hosts file etc)
  * /home  - home directory for users' files
  * /root  - special home directory for the root user
  * /usr   - "unix system resources", user related programs (static data)
  * /var   - variable data files, log files, files being written to constantly

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https://www.howtogeek.com/117435/htg-explains-the-linux-directory-structure-explained/ \\
https://www.geeksforgeeks.org/linux-directory-structure/ \\
Filesystem Hierarchy Standard (FHS) https://en.wikipedia.org/wiki/Filesystem_Hierarchy_Standard \\
History of /usr https://askubuntu.com/questions/130186/what-is-the-rationale-for-the-usr-directory \\

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Commands
https://twitter.com/mujeeb0147/status/1586324478606594050?t=NOWX0uHU7k-PnZsvqkeqOA&s=19

===== Programming =====

https://en.wikibooks.org/wiki/Bash_Shell_Scripting/Whiptail\\
http://akshaim.github.io/IoT/RPi/RaspberryPi-102.html\\
https://funprojects.blog/2022/04/06/text-interfaces-with-whiptail-and-dialog/\\

{{youtube>TuPO-eAMy4I?medium}}
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===== Ubuntu =====
https://tecadmin.net/how-to-install-xrdp-on-ubuntu-22-04/