Linux standard pronunciation: Mile na Kos
Linux is a UNIX-like systems, has the following characteristics:
1, free and open source
2, a high degree of modularity
3, extensive hardware support
4, security and stability
5, multi-user, multi-tasking (so often used in systems operation and maintenance, as well as to develop)
6, good portability
man files
man command to view a command usage
Spacebar: next page
q: quit, ending reading
/ Character and press Enter keyword search to find the desired (lowercase n look down, look up a capital N)
Similar function tool: info
info command to view a command documentation
Example: info ls