Linux Basic Instruction II

1. RM (remove)
   

   Function: Delete files or directories

   Syntax: RM [-I R F] [file/directory]

   Rm-i: Ask the user whether to confirm the deletion, with Y or N to answer;

   Rm-r: Add this option when deleting a directory, delete files and directories under directories and directories;

   Rm-f: Forced Delete, no confirmation.

2. MV (move)

Features: Moving files and directories, or renaming files (renaming)

Syntax: MV [-F i u] [source file or directory] [destination file or directory]

Mv-f: If the target file already exists, no direct overwrite is asked;

Mv-i: If the target file already exists, it will ask whether to overwrite;

Mv-u: If the target file already exists and the source file is newer, it will not be updated.

MV [source file or directory] [renamed file or directory]

Example: MV Test test2

3.mkdir (Make directory)

Function: Create an empty directory

Syntax: mkdir [-MP] [directory name]

MKDIR-M: Used to specify the permissions to create a directory, but rarely used, will be used chmod to handle;

Mkdir-p: Create multiple empty directories to recursively create directories.

4.rmdir (remove directory)

Function: Used to delete empty directory

Syntax: rmdir [-P] [directory name]

Rmdir-p: Represents a recursive delete directory. There are no files or directories in the directory. There are files that can only be deleted with Rm-f.

5.touch

Function: Create an empty file, and modify a file date to the current date.

Syntax: Touch [options] [filename]

6.find

Features: The Find command searches for files in the directory structure and can perform operations, and the Find function is powerful, so there are many options.

Syntax: Find [search scope] [match condition]

Example: $find/etc-name init: Find file init in directory/etc;

$find/etc-name init*:* match any character;

$find/etc-name Init??? :？ Match the delay character;

$find/etc-iname * *: Search by file name, case-insensitive.

$find/-size +204800: Look for files larger than 100MB in the root directory.

(+n: greater than;-N: less than; N: equals)

$find/home-user Andyzhu: Locate the file with the owner Andyzhu under the root directory.

(-group based on the owning group)

$find etc-cmin-5: Find files and directories with properties modified within 5 minutes under/etc.

(-amin access time access;-cmin file properties change;-mmin file contents Modify)

7.which

Function: View the path where the command is located

Syntax: which [command]

Example: Which ifconfig

8.whereis

Function: Find out which directory a command is in, and display the directory where the system commands and help manuals are located.

Syntax: Whereis [-BMSU] file or directory name

-B: Find only files in binary format

-M: Just find the file under the description file manual path

-S: Find source files only

-U: Find other special files that are not among the above three options

Example: Whereis-m passwd

9.locate

Features: Quickly find files

Syntax: Locate [-I r] Keyword

-I: Ignore case differences

-R: Can be followed by the display of regular expressions

Example: Locate passwd

10.whatis

function: Get a short description of the index

Syntax: Whatis [command]

Example: Whatis ifconfig

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Linux Basic Instruction II