++++++++++++++++++++++++++ ΧΡΗΣΙΜΑ URLS ++++++++++++++++++++++++++ https://www.tldp.org/HOWTO/Bash-Prog-Intro-HOWTO.html https://www.learnshell.org/ https://ryanstutorials.net/bash-scripting-tutorial/bash-script.php https://linuxconfig.org/bash-scripting-tutorial-for-beginners https://www.tutorialspoint.com/unix/shell_scripting.htm