find Command - Search Files & Directories

What Is the find Command?

The find command searches for files and directories based on criteria such as name, type, and whether they are empty.

Unlike tools that search an existing filename database, find walks through the directory structure from a specified starting location. By default, it searches recursively, including subdirectories.

It is useful for locating files, finding empty directories, and managing files across a Linux system.

Basic Syntax

find [path] [expression]

• path : The directory where the search begins. Use . for the current directory.
• expression : The conditions used to identify matching files or directories.

Searching by Name

1. Find a Specific File

find . -name "telusko.txt"

Searches for entries named telusko.txt in the current directory and all its subdirectories.

The -name option performs a case-sensitive name match.

For a case-insensitive search, use -iname:

find . -iname "telusko.txt"

This also matches names such as Telusko.txt and TELUSKO.TXT.

2. Find Files by Extension

Use the wildcard * to match multiple filenames.

find . -name "*.txt"

This finds entries whose names end in .txt, including files in nested directories.

Similarly, to find log files:

find . -name "*.log"

Note: Keep the wildcard pattern in quotes so the shell passes it to find instead of expanding it before the command runs.

3. Search in a Specific Directory

find /home -name "*.txt"

Searches for .txt entries inside /home and its subdirectories.

You can replace /home with any directory you want to search.

Searching by Type

The -type option lets you restrict results to a particular kind of filesystem entry.

4. Find Directories

find . -type d

Displays directories under the current location, including nested directories.

5. Find Regular Files

find . -type f

Displays regular files under the current location and its subdirectories.

This excludes directories and other types of filesystem entries, such as symbolic links.

Finding Empty Files and Directories

1. Find Empty Directories

find . -type d -empty

Displays directories that contain no files or subdirectories.

2. Find Empty Files

find . -type f -empty

Displays regular files with a size of zero bytes.

This can help identify unused placeholder files or files that were created but never populated.

Combining find with Pipes

You can combine find with other commands when you need to process its results further.

For example:

find . -name "*.log" | grep "error"

How it works:

1. find locates entries whose names end in .log.
2. The pipe (|) passes the resulting paths to grep.
3. grep displays paths containing the text error.

Important: This searches the file paths, not the contents of the log files. To search inside log files for lines containing error, use:

find . -type f -name "*.log" -exec grep -n "error" {} +

Here, find locates regular .log files, and grep searches their contents while displaying matching line numbers.

Quick Reference

Summary

• find searches the filesystem starting from a specified path.
• It searches subdirectories recursively by default.
• Use -name or -iname to search by name, and -type to filter by entry type.
• Use -empty to locate empty files or directories.
• Combine find with commands such as grep when additional filtering or processing is needed.

Remember: Use find when you need to locate files or directories by their names, types, or other conditions.

Written By: Muskan Garg