Linux basics #2: Basic Structure of the Linux File System

Linux basics #2: Basic Structure of Linux File System is an inverted tree structure. All files or folders are contained in a root directory. Linux is case sensitive. The name can contain a maximum of 255 characters except the forward slash (+). Each Shell has a current working directory. Run the command pwd (print work directory) you can view the current working directory touch command: Create a blank file or update an existing file (the last modification). the file at the beginning is a hidden file. The vast majority of the hidden files are the configuration file command "ls", which can list the current directory information. The following parameters are supported: ls-a displays all files, including hiding the ls-l display file DETAILS ls-R recursive display subdirectory information ls-ld display directory and link information command "file" can be used to view the specified file type Linux directory two concepts are used: absolute path and relative path: absolute path: start with the root directory "/", recursively returning each level of directory until the target file/folder, such as:/etc/passwd relative path: start with the current directory, path to the target file/folder, such :.. /.. /etc/passwd relative Basic path definition: ".." indicates the parent directory, "." indicates the current directory, and "~" Represents the current user's home directory, and "-" represents the previous working directory cd ~ When you get back to the home directory, you can directly press cd + enter to go back to the home directory. No matter in any directory, cd + press enter will go back to the home directory.