Linux Basics-File Lookup

Locate

Non-real-time, Fuzzy Lookup, lookup based on the system-wide file database.

UpdateDB: Manually generating a file database

Advantages: Fast Speed

Find

Real-time search, accurate search.

Grammar:

Find [Find path] [find standard] [processing action]

Find path: Default to current directory

Lookup criteria: Default to all files under the specified path

Handling actions: Default to show

options [Find criteria]:

-name ' filename ': Exact Match of file name

FileName wildcard *,? 、[]

-iname ' filename ': Matching file names is case insensitive

-regex PATTERN: Finding based on regular expressions

Find based on file properties

-user USERNAME: Based on owner Lookup

-group GROUPNAME: Search by Genus Group

-uid UID: Search by UID

-gid GID: Search by GID

-nouser: Finding files that are not owned by the master

-nogroup: Finding files that are not owned by a group

Find by File type

-type: Search by file type

F: Normal file

D: Catalogue

S: Socket file

C: Character device

B: Block device

L: Link File

P: Piping Equipment

Find by File size

-size: Search by File size

[+|-] #k: Find files larger than #k or less than #k

Based on logical AND or non-lookup

-A: represents and, while satisfied, defaults to the operation

-O: Represents or, satisfies a display

-not: Indicates a display that is not satisfied

Find by Time

-mtime +#: Find files with modified times greater than # days

-#: Find files with modified time less than # days

-atime +#: Find files with access times greater than # days

-ctime +#: Find files with state change times greater than # days

-mmin +#: Find files with modified time greater than # days minutes

Find based on permissions

-perm mode: Find files based on permissions, use MODE for exact lookups

-perm-mode: Indicates that each permission must match exactly

-perm/mode: Indicates that any one of the 9-bit permissions matches the lookup

Find action:

-print: Default value, display

-ls: Displays details of each file after matching in the form of a ls-l

-ok COMMAND {} \; Executes the command after the match. Note: This must be used here; is a terminator, otherwise a syntax error, {} is a file name placeholder

-exec COMMAND {} \; Executes the command after the match. Note: This must be used here; is a terminator, otherwise a syntax error, {} is a file name placeholder

Example: Find/-type f-exec chmod o-w {} \;

Finds files of type file in the current directory and removes write permissions for other users.

Find./-mtime +7-exec RM-RF {} \;

Find files in the current modified directory that are longer than 7 days and remove

Extended command

Xargs: Accepts commands from standard input and executes

Use pipe to accept, do not need to use {} placeholder, nor do you need \; end

Example:

Find/etc-size +1m-exec Echo {} >>/tmp/etc.bak \;

Find/etc-size +1m |xargs Echo >>/tmp/etc.bak

Both of these commands can be used to find files greater than 1M in/etc and write to the specified file

This article from "Liang Childe" blog, please be sure to keep this source http://iyull.blog.51cto.com/4664834/1884907

Linux Basics-File Lookup