Check Disk Usage on the Linux with du Command

Disk Usage on the Linux

Check Disk Usage on the Linux with du Command is a crucial aspect of maintaining a healthy Linux system. When storage starts to fill up, identifying which files or directories are consuming the most space can save time and prevent disruptions. The du (disk usage) command is an indispensable tool for this purpose, providing detailed insights into disk usage at the file and directory level.

Introduction

The du – disk usage command displays the amount of disk space used by files and directories on Linux systems. By default, it shows the disk usage of each directory and subdirectory within the current directory.

Basic `du` Syntax

du [OPTION]... [FILE]...

Commonly Used Options

Here are some of the most commonly used options with the du command:

-a or --all: Includes both files and directories in the output.
-h or --human-readable: Displays sizes in human-readable format (e.g., K, M, G).
-s or --summarize: Displays only the total for each argument.
-c or --total: Displays a grand total of the disk usage found by the other arguments.
--max-depth=N: Limits the output to directories (and files) at most N levels deep.
-d or --depth=N: Similar to --max-depth=N, shows the total for directories up to N levels deep.
--exclude=PATTERN: Excludes files that match the given pattern.

Basic Examples of `du` command

To display the disk usage in a human-readable format:

du -h

To display only the total disk usage of the current directory:

du -sh

To include all files in the output:

du -ah

To limit the depth of the directories shown in the output to two levels:

du --max-depth=2

To display a grand total at the end of the output:

du -ch

To exclude files that match a specific pattern:

du --exclude='*.log'

Displays disk usage of files and directories and summarize the total size of each argument:

du -skh *

Advanced Usage and Tips

Analyzing Large Directories: Combine du with other commands like sort and head to find the largest directories:

du -ah /path/to/directory | sort -rh | head -n 10

To see the memory usage of directories within a folder and sort them by size, you can use the du (disk usage) command combined with sort:

du -h --max-depth=1 /path/to/folder | sort -hr

Explanation

du -h --max-depth=1 /path/to/folder:
- du stands for “disk usage.”
- -h makes the output human-readable (e.g., in K, M, G for kilobytes, megabytes, and gigabytes).
- --max-depth=1 limits the command to only look at the top-level directories within /path/to/folder.
sort -hr:
- sort sorts the output.
- -h sorts by human-readable numbers.
- -r sorts in reverse order (i.e., from largest to smallest).