Example of how to use inode to delete specified files under Linux-Linux Operation and Maintenance-php.cn

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Example of how to use inode to delete specified files under Linux

黄舟

Oct 14, 2017 am 11:03 AM

inode linux delete

The inode of the file defines the size of the file, owner and other characteristics of the file. Every file and directory has its own unique inode number. So the following article mainly introduces you to the relevant information about using inode to delete specified files under Linux. Friends in need can refer to it. Let’s take a look together.

Preface

As we all know, in Linux, sometimes you encounter files with garbled names or some special Chinese characters. At this time It is difficult to delete by file name.

At the same time, any file in Linux must have its own unique inode value. At this time, the file with an abnormal file name can be deleted through the inode.

The objects of operation are generally files similar to the following:

[root@server tmp]# ll 
 
总用量 61404-rw-r--r-- 1 root root 0 6月 16 14:58 ? 
 
-rw-r--r-- 1 root root 0 6月 19 12:29 ?? 
 
-rw-r--r-- 1 root root 0 6月 21 14:53 ???3kqU-rw-r--r-- 1 root root 0 6月 21 14:53 ?6;?Xf??mA???9???T֙ 
 
-rw-r--r-- 1 root root 0 6月 19 12:29 9y??????sy?z?D?l???I?MO???8z????@]9??U@?XlAI]?k

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Reasons for generating such files:

1. Network abnormality when uploading files

2. Some file names created by Windows are in Linux It cannot be recognized normally

3. Chinese special characters cannot be recognized

The solution is as follows:

1. Query the inode values of these files

ll -i

[root@server tmp]# ll -i 
 
总用量 6140415206100 -rw-r--r-- 1 root root 0 6月 16 14:58 ?15206090 -rw-r--r-- 1 root root 0 6月 19 12:29 ??15206092 -rw-r--r-- 1 root root 0 6月 21 14:53 ???3kqU15206233 -rw-r--r-- 1 root root 0 6月 21 14:53 ?6;?Xf??mA???9???T֙ 
 
15206235 -rw-r--r-- 1 root root 0 6月 21 14:53 A??K?

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and above , the leftmost number is the inode value of the corresponding file, but the file cannot be deleted directly using the rm command, and other commands are required.

2. Delete abnormal files

Under normal circumstances, these files are rare. However, you should be careful when using rm commands. Do some testing beforehand and become proficient in the operation. Without these garbled files, you can Use normal files for testing.

There are several methods:

Create the required files first

[root@zstest1 tmp]# cd /tmp 
 
[root@zstest1 tmp]# touch aaa bbb ccc ddd eee 
 
[root@zstest1 tmp]# ll -i 
 
总用量 01442581 -rw-r--r-- 1 root root 0 9月 22 15:00 aaa1442582 -rw-r--r-- 1 root root 0 9月 22 15:00 bbb1442583 -rw-r--r-- 1 root root 0 9月 22 15:00 ccc1442584 -rw-r--r-- 1 root root 0 9月 22 15:00 ddd1442585 -rw-r--r-- 1 root root 0 9月 22 15:12 eee

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(1) Use the delete parameter that comes with find to delete aaa files

[root@zstest1 tmp]# find ./* -inum 1442581 -delete 
 
[root@zstest1 tmp]# ll -i 
 
总用量 0 
 
1442582 -rw-r--r-- 1 root root 0 9月 22 15:00 bbb 
 
1442583 -rw-r--r-- 1 root root 0 9月 22 15:00 ccc 
 
1442584 -rw-r--r-- 1 root root 0 9月 22 15:00 ddd 
 
1442585 -rw-r--r-- 1 root root 0 9月 22 15:12 eee

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(2) Use the -exec parameter that comes with find Combine the rm command to delete the bbb file (confirm the deletion)

[root@zstest1 tmp]# find ./* -inum 1442582 -exec rm -i {} \; 
 
rm：是否删除普通空文件 "./bbb"?y 
 
[root@zstest1 tmp]# ll -i 
 
总用量 0 
 
1442583 -rw-r--r-- 1 root root 0 9月 22 15:00 ccc 
 
1442584 -rw-r--r-- 1 root root 0 9月 22 15:00 ddd 
 
1442585 -rw-r--r-- 1 root root 0 9月 22 15:12 eee

Copy after login

(3) Use the -exec parameter that comes with find in combination with the rm command to delete the ccc file (do not proceed Delete confirmation)

[root@zstest1 tmp]# find ./* -inum 1442583 -exec rm -f {} \; 
 
[root@zstest1 tmp]# ll -i 
 
总用量 0 
 
1442584 -rw-r--r-- 1 root root 0 9月 22 15:00 ddd 
 
1442585 -rw-r--r-- 1 root root 0 9月 22 15:12 eee

Copy after login

(4) Use find and xargs to delete the ddd file (the -i parameter cannot be used for deletion confirmation)

[root@zstest1 tmp]# find ./* -inum 1442584 |xargs rm -f 
 
[root@zstest1 tmp]# ll -i 
 
总用量 0 
 
1442585 -rw-r--r-- 1 root root 0 9月 22 15:12 eee

Copy after login

(5) Use the rm command to delete the specified file (the file name found by the find command)

[root@zstest1 tmp]# rm `find ./* -inum 1442574` 
 
rm：是否删除普通空文件 "./eee"?y 
 
[root@zstest1 tmp]# ll 
 
总用量 0 
 
# 使用find命令的-inum选项确认文件名 
 
[root@zstest1 tmp]# touch fff 
 
[root@zstest1 tmp]# ll -i 
 
总用量 01442574 -rw-r--r-- 1 root root 0 9月 22 15:38 fff 
 
[root@zstest1 tmp]# find ./* -inum 1442574 
 
./fff

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To summarize:

The above different deletion methods generally all use the -inum option of the find command by specifying the inode value of the file. Confirm its file name, and then pass it to the rm command for deletion

Finished, hahaha

Summary

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