Important/Common directory descriptions that Linux ops people need to know

Important and Directory
/bin	Common binary command directories, such as Ls,cp,mkdir
/boot	Linux kernel boot System program required files directory
/dev	Device files directory, such as sound card, disk
/etc	Common system and binary installation package configuration file default path and service startup command directory
/home	Normal user's home directory default storage directory
/lib	Crying file storage Directory
/mnt	Usually used for temporary hanging on the storage device mount directory, such as Cdrom,u disk, etc.
/lost+found	The system has an accident that will produce some file fragments here
/opt	Indicates the optional meaning, some packages will be installed here, that is, custom packages, our own compiled packages, can be installed in this directory, through the source package installed software, you can pass the./configure--prefix/opt directory,
/proc	Operating system runtime, process information and kernel information (such as CPU, disk partition, memory information, etc.) stored here,/proc directory masquerading file system proc mount directory, Proc is not the real file system
/root	Linux Super User, root home directory
/sbin	Most of the commands that are designed for system administration are stored, which is the executable command location of the superuser root
/tmp	Temp file directory,
/usr	This is the directory of system storage programs, such as commands, help files, etc.
Important Sub-directories
/etc/sysconfig/network-scripts/ifcfg-eth0	Configure Network address and GW
/etc/resolv.conf	Configure the native DNS
/etc/hosts	Set the user IP and name of the corresponding table, equivalent to the local LAN DNS
/etc/sysconfig/network	Modify the machine name and network card startup configuration
/etc/fstab	Record the file system to mount on boot
/etc/inittab	Set the init process to set the system to what kind of runlevel and load the related boot file when the system starts
/etc/exports	Setting the configuration file path for NFS systems
/etc/init.d	This directory is used to hold the system or server scripts that are started in the System V mode, which is common in systems that are started or initialized by the mode V, such as Centos,redhat
/etc/xinit.d	If the server is running through XINETD mode, its script will be placed in this directory, some systems do not have this directory
/etc/profile	System Global environment variable configuration path
/etc/passwd	Account information
/etc/sudoers	Configuration files that can be sudo commands
/etc/syslog.conf	Log settings file
/etc/group	Set the user's ancestral name and related information
/var
/var/log/message	System Information default log file, very important
/var/log/secure	Records log in system access information files, weekly automatic cycle, for example, POP3,SSH,TELNET,FTP, etc. will be recorded in this
/proc
/proc/cpuinfo	Information about the processor, such as type, manufacturer, model, and performance
/proc/interrupts	The terminal being used, and the number of terminals
/proc/loadavg	System load information, uptime results

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Important/Common directory descriptions that Linux ops people need to know