Linux file Directory related commands

File directory related commands

Chong file built

Touch 111 Create a file 111

echo 'aaaaa' > 111 Write aaaaa to file 111 (overwrite the content in the previous 111)
echo 'bbbb' >> 111 writes bbbb to file 111 (appended to the last 111 content)

Create a Directory

mkdir A to create a directory
mkdir a/B Creates a directory and creates a B directory in the A directory, the error indicates that a directory does not exist

Parameter -p enables recursive creation
mkdir -p a/B was created successfully (a directory was created and B is created within the A directory)

Delete Directory

rmdir a    Delete a directory   (  can only delete empty directory  a directory must be empty)

Rm - r a    Delete a directory   ( - r  means delete   Include directory and file  )   (  can delete files in directories and directories   but will go in the directory to ask if each directory or file is deleted   need to press  y  to confirm the deletion  )

Do not want to ask for each directory file   Direct Delete can use  - f  parameters
rm  - rf a   Delete all directories and files within a directory do not ask   (  use  )



copy

CP 1. PHP 1. Php.bak Copy a file (plus -i parameter if 1.php.bak exists then ask if the overlay test is not added -I will also ask whether to overwrite)
CP a copy a catalog error
CP -r A copy directory must add -r parameter



Move a file or directory (or rename)

Mv1. PHP Test/1. PHP moves 1.php to the test directory
Mv1. PHP Test/2. PHP moves 1.php to the test directory and renames to 2.php
Mv-I1. PHP Test/2. php (Parameter-i) move the 1.php to the test directory and rename it to 2.php but if there is a duplicate name in the test directory 2.php then the hint is overwritten
MV Dir1 Test/DIR2 move the Dir1 directory to the test directory and rename it to Dir2 (move directory without parameters)



View the contents of a file (a small amount of content can only display one screen more than the last screen content)

Cat AAA View the contents of the AAA file
Cat -n AAA Display content line number
Cat -A AAA display all content including special symbols, etc.

View the contents of a file (you can use more when the file content is more than one screen)

More AAA View AAA file contents

Space shows next page
Enter to display the next line
Q or Q exit

less and more as much as the upside down function
J Upside Down K


Use more or less to use/or what? Search to search and then press N to find the next
/search down the current line and search up the current line




Head and tail

Head AAA Displays the first 10 lines of the AAA file (default 10 lines)
Head- theAAA Displays the first 15 lines of the AAA file

Tail AAA Displays the following 10 lines of the AAA file
Tail- theAAA displays the following 15 lines of AAA files

File Lookup

Find/Root/ -Name T1 in/Root/Directory to find files with file name T1 (exact match)
If you want to blur a lookup, you can use the wildcard character find/Root/-Name T*Find files beginning with T

*: matches any of any characters

？ : Matches an arbitrary character

-Size: Lookup based on file size (size in chunks) default chunk size is 512 bytes

Find/-Size+204800Finding files larger than 204,800 chunks in the root directory is larger than+Less than with-

Find/-UserChuang Find file owner in root directory is Chuang file

Linux file directory-related commands