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Linux is the most widely used server operating system. It is based on UNIX and free of charge. Because of the stability and security of the system, Linux has a high market share and almost becomes the best system environment for program code operation.
Linux can not only run the program code we wrote for a long time, but also be installed in various computer hardware devices, such as mobile phones, routers, etc. the bottom layer of Android program is running on Linux system.
I. directory structure of Linux
- Bin (binaries) holds binary executable files
- SBIN (super user binaries) stores binary executable files, which can only be accessed by root
- Etc (etcetera) stores system configuration files
- Usr (UNIX shared resources) is used to store shared system resources
- Home the root directory where user files are stored
- Root root root directory
- Dev (devices) is used to store device files
- Lib (Library) stores shared libraries and kernel modules needed for running programs in the file system
- Installation point for MNT (Mount) system administrator to install temporary file system
- Boot stores various files used for system boot
- TMP (temporary) is used to store various temporary files
- Var (variable) is used to store files that need to change data at runtime
2. Linux common commands
- Interpretation of the description format of Linux file permissions
- R-readable, w-writable, x-executable (or 111 110 100 — & gt; 764 in binary)
- Bit 1: file type (d directory, – normal file, l linked file)
- Bit 2-4: user permission, expressed by u (user)
- Bit 5-7: group permission, expressed in G (Group)
- Bit 8-10: other user rights, represented by O (other)
- Bit 2-10: all permissions, a (all)
III. common shortcut keys and symbolic commands in Linux system
IV. VIM editor
Author: icoder.long source: blog.csdn.net/xulong/article/details/81463054
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