Linux Security Basics: Use of the find command and use of the find command

Linux Security Basics: Use of the find command and use of the find command

The find command is used to find the specified file in the file system.

* Command Format: find pathname-option [-print-exex-OK]

 

1. pathname: directory path to be searched

~ Indicates the home Directory

. Indicates the current directory

/Indicates the root directory

 

2. Options

-Name: search by name

-Perm: search by File Permission

-Prune: not found in the specified directory

-Type: search by file type

-User: Find the file or directory of the specified owner

-Group: searches for files or directories in the specified group.

-Nouser: Search for files without a valid owner

-Nogroup: Find the objects in the five valid groups.

-Depth: searches for the deepest subdirectories in a specified directory.

-Size: searches for objects of the specified size.

 

3. Parameters

-Print: The find command outputs matching files to the standard output.

-Exec: The find command executes the shell command given by this parameter on the matching file. The corresponding command is in the form of 'command' {};. Note the space between {} And.

-OK: The Role of-exec is the same, but the shell command given by this parameter is executed in a safer mode. A prompt is displayed before each command is executed, let the user determine whether to execute.

 

4. Use the-name option to search by name

In the current directory and subdirectory, find the txt file starting with an upper-case letter.
Find.-name' [A-Z] *. txt '-print

In/etc and Its subdirectories, find the file starting with host
Find/etc-name 'mo * '-print

In the HOME directory and Its subdirectories, find all files
Find ~ -Name '*'-print

In the current directory and subdirectory, find txt files not starting with out
Find.-name "d *"-prune-o-name "*. txt"-print

 

5. Search by directory

Search for txt files in subdirectories other than aa in the current directory
Find.-path "./abc"-prune-o-name "*. txt"-print

Search for txt files in the current directory and subdirectories other than aa and bb
Find. \ (-path "./aa"-o-path "./bb" \)-prune-o-name "*. txt"-print

Find the txt file in the current directory and no longer in the subdirectory
Find .! -Name "."-type d-prune-o-type f-name "*. txt"-print

 

 

6. Search by File Permission

In the current directory and subdirectory, find the owner with read/write execution and other files with read execution permissions.
Find.-perm 755-print

 

7. Search by file type

Find the symbolic link file in the current directory and subdirectory
Find.-type l-print

Find all symbolic link files in the/etc directory. You can use

$ Find/etc-type l-print

 

8. Search for files by owner and group

Search for objects whose owner is tt
Find/-user tt-type f-print
Search for files deleted by the owner
Find/-nouser-type f-print
Search for admin files in the group
Find/-group admin-type f-print
Search for files deleted from a user group
Find/-nogroup-type f-print

9. Search by size

Search for files larger than 1 MB
$ Find/-size + 1 M-type f-print
Search for files equal to 6 bytes
$ Find.-size 6c-print
Search for files smaller than 32 KB
$ Find.-size-32 k-print