Linux-System Catalog Introduction

CentOS 7 system, does not differentiate between 32 bits and 64 bits.
1.man Command tree structure displays command usage
2. Command-help ibid., but not tree-shaped
3.tree function: The tree structure displays subdirectories under a directory.
Note: The runtime will prompt for no such command, so installation is required, Yum install-y tree
Usage: Tree/path
Tree-l 2/etc Display directory, two-tiered subdirectory structure

System directory:
1./bin;/sbin;/usr/bin;/usr/sbin holds some common commands, such as LS, tree, man, VI, mkdir
The difference between bin and sbin:
Sbin: It is generally used by the root user
Bin: Generally used by ordinary users, super users can also use


2./boot system boot file, such as grub file Delete This directory, system cannot start
3./dev device files, such as: CD, HDD, mouse, keyboard
Note: XXX for the device file
/etc configuration file for example: NIC configuration file
4./home User Home Directory,

5./lib,/lib64 system dynamic link library file, similar to the Windows. dll file. Note: Green for library files, class green files for soft links
/media Media directory default is empty, for example: plug in a USB stick, can be automatically recognized in this directory.
6./mnt temporarily hangs in the directory, default is empty, for example: the CD-ROM drive, the newly added hard disk, mount to this directory.
7./opt Oracle is typically installed in this directory
8./proc system boot process, generate PID
9./run the files generated by the system process. A shutdown, it will disappear.
10./srv Save, service-generated files
11./sys saving the system kernel files
Temporary directory for the 12./TMP system. Any user can read and write in this directory, but special permissions, each user can only manage their own files
13./USR user files, MySQL and some other services will be made available under this directory.
14./var log file,/var/messages system log
/var/run pid files are saved in this
How do I view a command that relies on those library files?
Usage: ldd/bin/ls

Linux-System Catalog Introduction