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Linux Link

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Following are important link releated to linux: 

Ubuntu Debian releated: 

1: https://www.debian.org/doc/manuals/debian-reference/ch02.en.html 

2: https://wiki.debian.org/DebianPackageManagement

 AD Integration Link:

http://www.overclockers.com/forums/showthread.php/709625-HowTO-Sync-Active-Directory-with-Directory-Server 

Squid Link:

1:  https://www.linuxnix.com/troubleshooting-squid-reverse-proxy-server/

Shell Scripting: 

1: https://bash.cyberciti.biz/guide/Main_Page 

2:  http://matt.might.net/articles/bash-by-example/

3: http://www.freeos.com/guides/lsst/

Mail Relay:
https://easyengine.io/tutorials/linux/ubuntu-postfix-gmail-smtp/ 

https://devanswers.co/configure-postfix-to-use-gmail-smtp-on-ubuntu-16-04-digitalocean-droplet/ 

Perl:
www.perltutorial.org 


DNS:

1: https://www.interserver.net/tips/kb/dns-dns-hierarchy/

2: https://en.wikipedia.org/wiki/Domain_name_registry

3: https://en.wikipedia.org/wiki/DNS_zone

4: https://raventools.com/marketing-glossary/root-domain/

Hard disk test tool: 

1: https://www.tecmint.com/linux-disk-scanning-tools/ 

2: https://www.cyberciti.biz/faq/find-hard-disk-hardware-specs-on-linux/ 

3: https://mintguide.org/system/283-how-to-check-and-fix-the-disk-for-errors-and-bad-sectors-in-linux-mint.html

 4: https://www.addictivetips.com/ubuntu-linux-tips/fix-a-bad-hard-drive-on-linux/

Kernal update for ubuntu

 https://linuxhint.com/upgrade-kernel-ubuntu-1804/


camel and maven learning:

http://javainuse.com/



All these above link i am posting here for your reference So that you people not frustated while searching stuff:
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