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What is Linux etc?

Linux etc is used to store the main configuration files of the system, such as the user's account password files, the start files of various services, etc. Generally speaking, the attributes of the files in this directory can be checked by ordinary users, but only root has the right to modify them.

Extended data

1. / etc/passwd user database, in which the domain gives the user name, real name, home directory, encrypted password and other user information.

2. / etc/mtab list of currently installed file systems, initialized by scripts and automatically updated by the mount command. Use when you need a list of currently installed file systems, such as the df command.

3. / etc/shadow the shadow password file on the system where the shadow password software is installed. The shadow password file moves the encrypted password from the / etc/passwd file to / etc/shadow, which is readable only to root, which makes it more difficult to decipher the password.

4. / etc/securetty confirms the security terminal, that is, which terminal allows root to log in. Generally only virtual consoles are listed, so it is not possible to break into the system and get super user privileges through modem or the network.

/ etc/shells lists trusted shell,chsh commands that allow users to change login shell within the scope specified in this file. The service process ftpd that provides a machine FTP service checks whether the user shell is listed in the / etc/shells file, and if not, the user will not be allowed to log in.

6. / etc/termcap terminal performance database, which explains what "escape sequence" is used to control different terminals. Instead of directly outputting escape sequences (which only work on terminals of a particular brand) when writing programs, you look for the correct sequence of work to be done from / etc/termcap. In this way, most programs can run on most terminals.

These are the details of what Linux etc is, please pay more attention to other related articles!

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