Content Today
1, TCP / IP architecture - Protocol Overview
2, query help
3, Linux directory structure
4, common command directory
1, TCP / IP architecture - Protocol Overview
- NFS protocol: is NetworkFileSystem shorthand, that is, network file systems, network file systems FreeBSD is a supported file system, also known as NFS.NFS allows a system to share directories and files with others over a network. By using NFS, users and programs can access the same files as access to local files on the remote system.
- In the TCP / IP protocol suite, there are two different transmission protocols: the TCP (transmission control protocol), the UDP (User Datagram Protocol); port range: 1-65535
TCP is a one to one relationship, so UDP is more reliable with respect; UDP-many relationship, it is more unreliable.
- ** Ethernet protocol: Ethernet is the most widely used LAN technology. Due to its simplicity, low cost, scalable, can be well combined with the characteristics of IP networks, Ethernet technology applications are moving from the internal network to the public telecommunication field. Ethernet Ethernet access technology and refers to the combination of cabling, the public telecommunication network as the access network provides IP-based transport path of multiple services directly to the user. (The basis of today's Internet)
2, query help
a, help command classification:
1, the internal command --- help Command
2, external command --- command --help (-h)
b、man（more): man command
/: Down to find specific content
---- n: look down; N: up to find
? : Look up the specified content
---- n: up to find; N: Find downwardly
c, Baidu Google: Finding the time to understand what it meant, but look at an example (code shows)
3, Linux directory structure
1, the directory structure under Windows:
2, Linux (Ubuntu) directory structure:
- Tree: all files (both from the root) in the root
4, common command directory