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ΧΡΗΣΙΜΑ URLS
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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