Linux command line and shell scripting---bash shell commands

PS1 = "[\t][\u]\$"//New shell prompt shows the current time and user name

In Windows, you often see such file paths: D:\work\FTL Moniqi\ftl_lru-0513\ftl_lru-0513\si

Linux takes a different approach. Linux stores files in a single directory structure, a directory that we call virtual directories. The virtual directory contains the file paths for all storage devices installed on the PC.

Linux uses the forward slash "/" instead of the backslash "\" to plan the directory in the file path.

Relative path: There are two special characters

1. A single dot (.), which indicates the current directory;

2. Double dot character (.. ) that represents the parent directory of the current directory

The two-point Mr. Foo takes the user to the top-level directory and, if necessary, the user can switch the directory up by multiple double points.

Standard wildcard characters:

1. The question mark represents a character.

2. An asterisk represents 0 or more characters.

There are two different kinds of file links in Linux:

1. Symbolic links, i.e. soft links;

2. Hard Links

A hard link creates a stand-alone file that contains the information and location of the source file. Referencing a hard-link file is equivalent to referencing a source file

Cp-l test1 test4

The-l parameter creates a hard-link test4 that points to the file test1.

Note: You can only create hard links between files on the same storage media, and you cannot create hard links between files under different mount points.

The parameter-s creates a symbolic link, or a soft connection

Cp-s Test TEST5

When copying a linked file, be aware that if you use the CP command to copy a file that is linked to another source file. The copy is actually another copy of the source file. Instead of a linked file.

Stat command: You can provide all state information for a file on a file system.

File command: One to view files of type

Linux command line and shell scripting---bash shell commands