Summary of usage of the Find (file Lookup) command under Linux

Find A traversal lookup of the entire system without specifying a lookup directory

use Format : Find [ specify Find directory ] [ find rule ] [ action executed after find ]

[ Specify Find directory ] For example :

[Email protected] images]# find/etc//tmp//root-name passwd

It is important to note that spaces are separated between directories.

[ Find rules ]

(1) Search by file name

#-name // Search by file name (exact search)

#-iname// Search by file name, but not case sensitive

here is another introduction to the name of the knowledge of the wildcard

* indicates a wildcard of any character

[[email protected] ~]# Find/-name "*.img"

？ Indicates the wildcard of any single character

[Email protected] ~]# find/etc/-name "PASSW?

[] denotes any one of the characters in the wildcard brackets

[[email protected] ~]# Find/-name "[ab].sh"

(2) Find files based on the users and groups they belong to

#-user// search for files based on owner

#-group// search for files by genus Group

(3) Find users based on uid and GID

#find/tmp-uid// find uid is a file of

#find/tmp-gid// find gid is a file of

(4) Find files based on the relevant attributes of the file timestamp

We can use the Stat command to view the time information for a file as follows:

#-atime

#-mtime

#-ctime

#-amin

#-mmin

#-cmin

So here atime,mtime,ctime is the corresponding "Last access time" Last content modification Time "Last Property modification Time", here the atime unit refers to "Day",Amin the units are minutes

#find/tmp–atime +5// to find files that have not been accessed within five days

#find/tmp-atime-5// to find files that have been accessed within five days

(5) Find files according to file type

-type

f// normal file

d// directory file

L// link file

b// block device files

c// character device files

p// pipeline file

s//socket file

(6) Search for files based on size

-size

#find/tmp-size 2M//Find files equal to 2M in/tmp directory

#find/tmp-size +2m//Find files larger than 2M in the/tmp directory

#find/tmp-size-2m//Find files less than 2M in the/tmp directory

(7) Find files based on file permissions

-perm

#find/tmp-perm 755//Find a file in the/tmp directory with permissions of 755

#find/tmp-perm +222//indicates that only one type of user (owner, group, other) can match write permissions

#find/tmp-perm-222//indicates that all category users must be satisfied with Write permission

(8)-nouser And-nogroup

#find/-nogroup–a–nouser//Search the entire system for files that are neither master nor group (such files are usually dangerous, we should clear them in time as system engineers)

[Find out the action of execution]

#-print//actions by default

#-ls//find it and use LS to show it

#-OK [commend]//Find out when executing a command to ask the user whether to perform

#-exec [commend]//Search after the execution of the command without asking the user, directly execute

Here is the use of {} : replace the found file

#find/tmp-atime +30–exec rm–rf {} \; # Delete found more than a few days have not accessed the file

Example: Find files owned by all users student and copy them to the/root/findfiles directory

[Email protected] ~]# Mkdir/root/findfiles
[[email protected] ~]# Find/-user student-type f-exec cp-p {}/root/findfiles/\;
Or
[Email protected] ~]# cp-p
$ (Find/-user student-type f)/root/findfiles/

    

Summary of usage of the Find (file Lookup) command under Linux