Where is the etc directory in linux?

In Linux, the location of the etc directory is in the main directory, that is, "/etc"; etc is the abbreviation of Etcetera, which means "and so on", and is used to store all the information needed for system management. Configuration files and subdirectories, basically hardware and software configuration files are in this directory.

#The operating environment of this tutorial: linux7.3 system, Dell G3 computer.

Where is the etc directory in Linux

In Linux, the location of the etc directory is in the main directory

After logging in to the system, enter the command in the current command window:

 ls /

The output results are as follows:

/etc:

etc is the abbreviation of Etcetera (etc.). This directory is used to store all configuration files and subdirectories required for system management.

For example, /etc/passwd is the system user configuration file, /etc/group is the user group configuration file, /etc/xinetd.conf is the configuration file of the xinetd service, and /etc/resolv.conf is used to specify The DNS server address of this machine, etc.

By editing these files, you can change and manage the system.

Extended knowledge

/etc directory is generally used to store the configuration files of the entire file system required by the program.

/etc directory

Contains many files. Many network configuration files are also in /etc.

/etc/rc or/etc/rc.d or/etc/ rc*.d

Scripts or directories of scripts that are run when starting or changing run levels.

/etc/passwd

User A database whose fields give the username, real name, home directory, encrypted password, and other information about the user.

/etc/fdprm

Floppy disk parameters Table. Describes different floppy disk formats. Set with setfdprm.

/etc/fstab

Mount -a command at startup (in /etc/rc or equivalent Startup file) list of automatically mounted file systems. Under Linux, it also includes information about the swap area enabled with swapon -a.

/etc/group

Similar /etc/passwd, but the description is not the user but the group.

/etc/inittab

init configuration file.

/etc/issue

The output information of getty before the login prompt. Usually includes a short description or welcome message of the system. The content is determined by the system administrator.

/etc/magic

　file configuration file. Contains instructions for different file formats, file guesses the file type based on it.

/etc/motd

　Message Of TheDay, automatically output after successful login. The content is determined by the system administrator. It is often used for notification information, such as warnings about planned shutdown time.

/etc/mtab

List of currently installed file systems. Initialized by scripts and automatically updated by the mount command. Used when a list of currently installed file systems is required, such as the df command.

/ etc/shadow

Shadow password file on a system with shadow password software installed. The shadow password file moves the encrypted passwords in the /etc/passwd file to /etc/shadow, which only Readable by root. This makes deciphering passwords more difficult.

/etc/login.defs

Configuration file for the login command.

/etc/printcap

Similar to /etc/termcap, but for printers. The syntax is different.

/etc/profile, /etc/csh.login,/etc /csh.cshrc

File executed by Bourne or Cshells at login or startup. This allows system administrators to establish a global default environment for all users.

/etc/ securetty

Confirm the secure terminal, that is, which terminal allows root login. Usually only the virtual console is listed, so that it is impossible (at least difficult) to break into the system via modem or network and obtain superuser privileges .

/etc/shells

List the trusted shells. The chsh command allows users to change the login shell within the scope specified in this file. Provides FTP service for a machine The service process ftpd checks whether the user shell is listed in the /etc/shells file. If not, the user will not be allowed to log in.

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