The Linux Find Command is one of the most important and much used command in Linux systems. Find command used to search and locate list of files and directories based on conditions you specify for files that match the arguments. Find can be used in variety of conditions like you can find files by permissions, users, groups, file type, date, size and other possible criteria.

Lets see few important "find command examples"

Part I – Basic Find Commands for Finding Files with Names

1. Find Files Using Name in Current Directory
Find all the files whose name is amit.txt in a current working directory.
# find . -name amit.txt
./amit.txt

2. Find Files Under Home Directory
Find all the files under /home directory with name .txt.
# find /home -name amit.txt
/home/amit.txt

3. Find Files Using Name and Ignoring Case
Find all the files whose name is amit.txt and contains both capital and small letters in /home directory.
# find /home -iname amit.txt
./amit.txt
./amit.txt

4. Find Directories Using Name
Find all directories whose name is amit in / directory.
# find / -type d -name amit
/amit

5. Find PHP Files Using Name
Find all php files whose name is amit.php in a current working directory.
# find . -type f -name amit.php
./amit.php

6. Find all PHP Files in Directory
Find all php files in a directory.
# find . -type f -name "*.php"

./amit.php
./login.php
./index.php

Part II – Find Files Based on their Permissions

7. Find Files With 777 Permissions
Find all the files whose permissions are 777.
# find . -type f -perm 0777 -print

8. Find Files Without 777 Permissions
Find all the files without permission 777.
# find / -type f ! -perm 777

9. Find SGID Files with 644 Permissions
Find all the SGID bit files whose permissions set to 644.
# find / -perm 2644

10. Find Sticky Bit Files with 551 Permissions
Find all the Sticky Bit set files whose permission are 551.
# find / -perm 1551

11. Find SUID Files
Find all SUID set files.
# find / -perm /u=s

12. Find SGID Files
Find all SGID set files.
# find / -perm /g+s

13. Find Read Only Files
Find all Read Only files.
# find / -perm /u=r

14. Find Executable Files
Find all Executable files.
# find / -perm /a=x

15. Find Files with 777 Permissions and Chmod to 644
Find all 777 permission files and use chmod command to set permissions to 644.
# find / -type f -perm 0777 -print -exec chmod 644 {} \;

16. Find Directories with 777 Permissions and Chmod to 755
Find all 777 permission directories and use chmod command to set permissions to 755.
# find / -type d -perm 777 -print -exec chmod 755 {} \;

17. Find and remove single File
To find a single file called amit.txt and remove it.
# find . -type f -name "amit.txt" -exec rm -f {} \;

18. Find and remove Multiple File
To find and remove multiple files such as .mp3 or .txt, then use.
# find . -type f -name "*.txt" -exec rm -f {} \;

OR

# find . -type f -name "*.mp3" -exec rm -f {} \;

19. Find all Empty Files
To file all empty files under certain path.
# find /tmp -type f -empty

20. Find all Empty Directories
To file all empty directories under certain path.
# find /tmp -type d -empty

21. File all Hidden Files
To find all hidden files, use below command.
# find /tmp -type f -name ".*"

Part III – Search Files Based On Owners and Groups

22. Find Single File Based on User
To find all or single file called amit.txt under / root directory of owner root.
# find / -user root -name amit.txt

23. Find all Files Based on User
To find all files that belongs to user amit under /home directory.
# find /home -user amit

24. Find all Files Based on Group
To find all files that belongs to group Developer under /home directory.
# find /home -group developer

25. Find Particular Files of User
To find all .txt files of user amit under /home directory.
# find /home -user amit -iname "*.txt"
Part IV – Find Files and Directories Based on Date and Time

26. Find Last 50 Days Modified Files
To find all the files which are modified 50 days back.
# find / -mtime 50

27. Find Last 50 Days Accessed Files
To find all the files which are accessed 50 days back.
# find / -atime 50

28. Find Last 50-100 Days Modified Files
To find all the files which are modified more than 50 days back and less than 100 days.
# find / -mtime +50 –mtime -100

29. Find Changed Files in Last 1 Hour
To find all the files which are changed in last 1 hour.
# find / -cmin -60

30. Find Modified Files in Last 1 Hour
To find all the files which are modified in last 1 hour.
# find / -mmin -60

31. Find Accessed Files in Last 1 Hour
To find all the files which are accessed in last 1 hour.
# find / -amin -60

Part V – Find Files and Directories Based on Size

32. Find 50MB Files
To find all 50MB files, use.
# find / -size 50M

33. Find Size between 50MB – 100MB
To find all the files which are greater than 50MB and less than 100MB.
# find / -size +50M -size -100M

34. Find and Delete 100MB Files
To find all 100MB files and delete them using one single command.
# find / -size +100M -exec rm -rf {} \;

35. Find Specific Files and Delete
Find all .mp3 files with more than 10MB and delete them using one single command.
# find / -type f -name *.mp3 -size +10M -exec rm {} \;

In my next article I will discuss more about other Linux commands in depth with practical examples. 
 
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Maintained By Amit Maheshwari