Mastering Linux Find: 8 Powerful Use Cases for System Operations

The find command is a must‑know tool for Linux operations and system administration.

Interview question: How to delete log files in a .logs directory that haven’t been accessed for over a year? find . -type f -atime +365 -exec rm -rf {} \; If you’re not comfortable with the command above, this article introduces eight practical find use cases that will help you master it.

1. Find files by name or regular expression

Search for a specific file name: find . -name test.txt Search for all PDF books using a pattern: find ./yang/books -name "*.pdf" Specify the file type for clarity:

find ./yang/books -type f -name "*.pdf"

2. Find files of different types

Search for directories: find . -type d -name "yang*" Search for symbolic links:

find . -type l -name "yang*"

3. Find files by timestamp

Linux tracks three timestamps:

atime : last access time.

mtime : last modification time.

ctime : last status change time (ownership, permissions, etc.).

Find files with access time older than one year: find . -type f -atime +365 Find files with modification time exactly five days ago (no + sign): find . -type f -mtime 5 Find files with change time between five and ten days ago:

find . -type f -ctime +5 -ctime -10

4. Find files by size

Use -size with units (b, c, w, k, M, G):

find . -type f -size +10M -size -1G

5. Find files by permissions

Search for files with specific permission bits (e.g., 777):

find . -type f -perm 777

6. Find files by ownership

Search for files owned by a specific user:

find -type f -user yang

7. Execute a command on found files

After locating files, you can run actions such as delete or list them using -exec: find . -type f -atime +5 -exec ls {} \; Note: the command after -exec must end with an escaped semicolon ( \;).

8. Search by directory name

Find directories by name (case‑sensitive):

find /path/to/search -type d -name "directory_name"

Case‑insensitive search:

find /path/to/search -type d -iname "directory_name"

Find the most recently modified directory:

find /path/to/search -type d -printf '%T+ %p
' | sort -n | tail -1

After reviewing these eight techniques, the original interview question becomes straightforward; you can now provide the exact command and explain each part.