Rhcsa notes 3

1. Soft connection and hard connection

 2. First level directory

/bin Catalog ：bin by binary Abbreviation , Necessary execution documents for the main placement system

/boot Catalog ：boot It's the boot program , The directory where the kernel is stored . This directory contains the necessary files during the boot process , Bootloader related files

/dev Catalog ：dev It's a device （device） English abbreviations . Contains all device files

/etc Catalog ：(Editable Text Configuration), It stores various configuration files and subdirectories used in system management

/home Catalog ： User's home directory , This is the default user directory of the system (home directory)

/lib Catalog ：(library) There are many function libraries in the system , and /lib The function library that will be used at startup is placed , And in /bin or /sbin The next instruction will call the library

/lib64 Catalog ： The storage system itself needs 64 Shared function library of bit program (library)

/mnt and /media Catalog ：mnt It's Mount （mount） Abbreviation , Both can temporarily mount other file systems in this directory , That is, provide mount points for other file systems

/opt Catalog ：(Optimized Production Technology), This directory is usually provided for use by larger third-party applications , for example Sun Staroffice、Corel WordPerfect, This avoids spreading files across the entire file system

/proc Catalog ：(process file system), You can get system information in this directory . This information is generated by the system itself in memory

/root Catalog ： Super user's personal directory , Ordinary users don't have access to

/run Catalog ： Save a file describing system information since system startup

/sbin Catalog ：(system binary), and /bin similar , These files are often used for system management , Only root You can use

/srv Catalog ：srv Can be regarded as service Abbreviation , It's after some web services start up , The directory of information that these services need to access

/sys Catalog ： This directory maps some information of the kernel to files , For use by applications

/tmp Catalog ： It is used to store temporary files generated during the execution of different programs

/usr Catalog ： The directory where the general user program is installed , Used to install various applications

/var Catalog ： Usually, various system log files are placed here

3. create a file , Delete file , Create directory , Delete directory

create a file

  Delete file

Create directory

  Delete directory

4.cp command

Copy files to directory rename