What is Zend Engine in PHP

Zend Engine is used internally by PHP as a complier and runtime engine. PHP Scripts are loaded into memory and compiled into Zend opcodes. These opcodes are executed and the HTML generated is sent to the client.

The Zend Engine is an open source scripting engine, commonly known for the important role it plays in the web automation language PHP. It was originally developed by Andi Gutmans and Zeev Suraski while they were students at the Technion - Israel Institute of Technology.

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Unix questions and answers for Root user

Question: How to login as super admin?
Once you login in console, the root account is not active by default.
To be active as super admin, you need to execute following commands.

sudo -su root

Question: How to change the permission of folder?

chmod 755 folder 

Question: How to change the permission of multiple folder?

chmod 755 foldername1 foldername2 foldername2

Question: How to change the permission of folder in Recursive?

chmod -R 755 folder 

Question: How to change the ownership of folder?

sudo chown user:group foldername

Question: How to change the ownership of multiple folder?

sudo chown user:group foldername1 foldername2 foldername2

Question: How to change the ownership of folder in Recursive?

sudo chown -R user:group foldername

Question: How to change the folder permission only not files?

find . -type d -exec chmod 751 {} \;

Question: How to change the folder permission only in Recursive not files?

find . -type d -exec chmod -R 751 {} \;

Question: Who is login is ssh?

whoami

Question: How to change the password of user?

passwd username

(Now it will prompt for new password and re-enter password)


Question: Give example of understanding from 0-7?

Number	Read (R)	Write (W)	Execute (X)
0	No	No	No
1	No	No	Yes
2	No	Yes	No
3	No	Yes	Yes
4	Yes	No	No
5	Yes	No	Yes
6	Yes	Yes	No
7	Yes	Yes	Yes

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