File lookup and file permissions

1. find Use of commands and options

command	explain
find	Find the file in the specified directory ( Including directory )

find Command options :

Options	explain
-name	According to the file name ( Include directory name ) Word search

2. find Command combined with wildcard

wildcard :

Is a special statement , It has an asterisk (*) And question mark (?), Used to blur search files

wildcard	explain
*	representative 0 Any character or characters
?	Represents any character

Expand :

Wildcards can not only combine  find  Command to use , It can also be used in conjunction with other commands , such as : ls、mv、cp  etc. , It should be noted here that only  find  The command uses wildcard characters and requires quotation marks .

3. chmod Introduction to the order

command	explain
chmod	Modify file permissions

chmod There are two ways to modify file permissions :

• Alphabet
• Digital method

4. chmod The use of alphabet

Role description :

role	explain
u	user, Represents the owner of the file
g	group, Represents a user group
o	other, Means other users
a	all, Represents all users

Permission setting description :

The operator	explain
+	Increase the permissions
-	Revoke authority
=	Set the permissions

Permission specification :

jurisdiction	explain
r	Can be read
w	Can write
x	Executable
-	No authority