Basics of Linux Basics (ii) Linux file system infrastructure

The Linux file system is an inverted tree structure, all files or folders are contained in a root directory "/".

Linux systems are strictly case-sensitive and have a name of up to 255 characters

All valid characters except forward slash

Each shell has a current working directory, with command pwd (print work directory) to view the current working directory

Touch command: Create a blank file or update the (last modified) time of an existing file

The file that starts with. is a hidden file, and most of the hidden files are configuration files.

The command "LS" can list current directory information and support the following parameters:

LS-A displays all files, including hidden files

Ls-l Show details of files

Ls-r recursively display subdirectory information

LS-LD Display directory and link information

Command ' file ' can be used to view the file type of the specified file

Linux directory management uses both absolute and relative paths:

Absolute path: To the root directory "/" as the starting point, recursively each level of directory until the destination file/folder, such as:/etc/passwd

Relative path: The path to the destination file/folder, starting at the current directory, such as:. /.. /etc/passwd

The relative path is basically defined as: ".." Represents the Superior directory, "." Represents the current directory,

"~" represents the current user's home directory, and "-" represents the previous working directory

CD ~ Back home directory, direct CD + return is also home directory, no matter in any directory, cd+ return is home directory

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