Unix operating system

Dear Sir,

 

How can I download Unix operating system?

How can I study unix by online?

If I study after finish can I get certificate?

 

Samphors

 

 

Applifone Co.ltd
Phnom Penh Center,Block A,
Corner Sihanuk & Sothearos,
Tonle Basac,Chamkarmon,
Phnom Penh,Cambodia.
Tel: [phone]
E-mail:  <mailto:[e-mail]> [e-mail]

 

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