Common uses of common commands

1.PWD: Output Current working directory

-L: Displays the current directory, containing the link in time (default property)

-P; Show links to the original file directory

2.screen: Terminal Screen Management

–S: Create a new screen session:

–x: Join Screen session:

Exit: Exit and close the screen session:

Ctrl+a,d: Peel the current screen session:

-ls: Displays all screen sessions that are already open:

-R: Resuming a screen session

3.echo: Standard output of strings

-N: does not wrap characters at the end of the line

-E: If the following characters appear in the string, they are handled in particular, not as normal text output

\a; to make a warning sound

\b: Backspace key

\c: Finally, no line break symbol is added

\ n; Wrap and move the cursor to the beginning of the line

\ r; Enter, that is, the cursor moves to the beginning of the line, but does not wrap

\ t; Insert tab

\ \; Insert \ Character

\0NNN: inserting ASCII characters represented by NNN (octal)

4.history: View History

-C: Empty command history

-D: Delete the command specified in history

#: Show Recent # History

-A: Append the newly executed command history list to the history file for this session

-N: Read unread rows to History list in history file

-r: Read history file attached to History list

-W: Save History list to specified history file

-P: Expands the history parameter into multiple lines, but does not exist in the history list

-S: Expands the history parameter into a row, appended to the history list

5.ls: List current or specified directory contents

-A: Contains hidden files

-L: Show additional information

-r: Directory recursion through

-ld: Directory and Symbolic link information

-1: File branch display

–S: Sort by big to small

–u: with-t option, display and press atime new to old sort

–U: Do not sort by directory store order display

6.touch: Change file timestamp

-A: Change atime only

-M: Change Mtime only

-t:stamp: [[CC]YY]MMDDHHMM[.SS]

-C: If the file does not exist, it is not created

7.CP: Copying files

-I: Interactive

-R,-r: recursively copy directories and all internal content;

-A: Archive, equivalent to-DR--preserv=all

-d:--no-dereference--preserv=links does not copy the original file, only the link name is copied

--preserv[=attr_list] Mode: Permission ownership: belongs to the main group Timestamp:links xattr context All

-P: Equivalent--preserv=mode,ownership,timestamp

-V:--verbose

-F:--force

8.RM: Delete command

-I: Interactive

-F: Force delete

-R: Recursive

9.tree Display directory tree

-D: Show only directories

-L Level: Specifies the number of levels to display

-P Pattern: Displays only the paths that are matched by the specified pattern

10.mkdir Creating a Directory

-P: exists in no error, and can automatically create the required directories;

-V: Show more information

-M MODE: Specify permissions directly when creating a directory;

11.rmdir Delete Empty Directory

-P: Recursive deletion of the parent empty directory

-V: Show more information

Common uses of common commands