1. Red Hat certification
Can not skip the exam
2. What is open source
Open source code (Open Source Code)
advantages: low risk, high quality, low cost, more transparency
3. The shared spirit of open source
Use free
copy free: unlimited copied to any person's computer, and does not limit the number of copies
spread of freedom:
the freedom to modify: There can be modified on the basis of free open source software on
freedom derivatives
free charge
4. Open source license
When you become the author of open source software, consider what kind of open source license you use.
GNU, BSD...
5. Linux development history
1970 UNIX open source
1979 AT&T retracted closed source
1984 GNU open source project
1987 gcc compiler The earliest C language compiler is paid, gcc is the first free C language compiler
1991 Linus Trovalds of the University of Helsinki in Finland developed Linux
1994 Bob Young rich second generation created Redhat
1998 is a turning point Intel and IBM strongly support Linux
6. The share of Linux system
499 of the top 500 supercomputers are Linux and 1 UNIX
7. Comparison between Linux and Windows (the advantage of Linux)
Stable and efficient
Free or a small fee
(Redhat is a subscription fee, the fee for providing technical support, bug fixes are charged if RedHat technical support is passed, and Windows installation requires a license) There are
few vulnerabilities and quick fixes
. Multitasking and multiple users are
more secure The user and file permission strategy is
suitable for the embedded system of small kernel programs, which is
relatively resource-free (can be customized)
8. Common Linux distributions (systems evolved from Linux as the kernel)
RedHat Enterprise Linux RHEL
CentOS is a derivative version of Redhat. Free RHEL has stopped updating. CentOS Steam has a
new version of RHEL, and there will be a corresponding version of CentOS
Fedora desktop-based Linux
...