10 knowledge points for Linux beginners

10 knowledge points for Linux beginners
GuideFor some new users, Linux doesn't feel like a start, or you don't know where to start learning it? How to Learn? To address these issues, I will tell you about the ten knowledge points that beginners need to learn about Linux.

Case Sensitive

Linux is a case-sensitive system. For example, Mozilla, MOZILLA, mOzilla, and mozilla are four different commands (but only the fourth mozilla command is actually valid ). Also, my_filE, my_file, and my_FILE are three different files. User login names and secrets are also case sensitive (this is because UNIX systems and C languages are traditionally case sensitive ).

Named file name

A file name can contain a maximum of 256 characters, including numbers, periods (.), underscores (_), and crossbars (-), and other undesirable characters.

Show Hidden Files

The file with "." in front of the file name is generally not displayed when you enter the "ls" or "dir" command. You can think of these files as implicit files. Of course, you can also use the "ls-a" command to display these files.

Root directory

"/" Equals to "\" under DOS (root directory, which means the parent directory of all other directories, or an interval between directories and files ). For example, cd/usr/doc.

Directory tree

In Linux, all directories are displayed under a single directory tree (different from the drive ID of the DOS system ). This means that all files and directories on all physical devices are merged under a single directory tree.

Note

In the configuration file, the line with the # header is a comment line. When modifying the configuration file, try not to delete the old settings-you can add "#" to the original settings to the comment line, and always add some comments about the changes to the modification place, you will find that you will benefit a lot in future management.

Main directory

Linux is an inherited multi-user operating system. Put your personal settings (and other users' personal settings) in your home directory (usually/home/your_user_login_name ). The names of many configuration files start with ".", which is invisible to users.

/Etc directory

The entire system scope is generally set under the/etc directory.

Access permission

Similar to other multi-user operating systems, in Linux, files and directories have their own owner and access permissions. In general, you are only allowed to file under your home directory (/home/your_user_login_name ). Learn about file permission management. Otherwise, you will find Linux very troublesome.

Parameters

Command Parameter options are generally guided by "-", followed by a character (or "--", when the option exceeds one character ). In this way, "-" is a bit like "/" in DOS "/". For example, enter the rm -- help Command.

From: http://blog.chinaunix.net/u1/38490/showart_301845.html

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