Find the Total Size of All Files in a Directory on Linux

Finding the total size of all files in a directory is a common task for Linux system administrators and users who need to monitor disk usage and manage storage effectively. Linux provides several command-line tools and GUI applications to calculate directory sizes in various formats.

Understanding directory sizes helps users identify storage bottlenecks, clean up unnecessary files, and optimize system performance. This guide covers multiple methods to find the total size of directories on Linux systems.

Finding the Total Size Using Command-Line Tools

The du Command

The du (disk usage) command is the most commonly used tool for checking directory sizes. By default, it displays sizes in kilobytes and includes subdirectories.

du

830720	./Information
166144	./Images
996868	.

To get only the current directory size excluding subdirectories, use the -s (summarize) option:

du -s

996868	.

For human-readable output, use the -h option which displays sizes in KB, MB, or GB:

du -h
du -sh

812M	./Information
163M	./Images
974M	.

Advanced du Options:

• Apparent size Shows actual file sizes rather than disk usage:

du -sh --apparent-size

• Specific directory Check size of a particular directory:

du -sh ~/Documents

• Exclude files Skip certain file types:

du -sch --exclude '*.log'

• Limit depth Control subdirectory scanning levels:

du -hc --max-depth=1
du -d1 -hc

• Sort by size Display largest directories first:

du -h --max-depth=1 | sort -hr

The ncdu Command

The ncdu (ncurses disk usage) command provides an interactive interface for browsing directory sizes. Install it first:

sudo apt install ncdu -y          # Ubuntu/Debian
sudo yum install ncdu             # RedHat/CentOS

Run ncdu to get an interactive display:

ncdu

This displays a navigable interface where you can use arrow keys to browse directories and see real-time size information. You can specify a target directory:

ncdu /var

The tree Command

The tree command displays directory structures in a tree format with size information. Install if not available:

sudo apt install tree -y          # Ubuntu/Debian
sudo yum install tree             # RedHat/CentOS

Display directories with sizes in human-readable format:

tree -dh

[4.0K] .
??? [4.0K] Images
??? [ 20K] Information

Combine tree with du functionality:

tree --du -h

Comparison of Command-Line Tools

GUI Tools for Directory Size Analysis

QDirStat

QDirStat is a Qt-based graphical tool that provides treemap visualization of directory sizes. It shows directories and files in a heat-map representation, making it easy to identify large files and directories.

sudo apt install qdirstat -y

Launch from terminal or applications menu:

qdirstat

FileLight

FileLight displays disk usage in an interactive pie chart format using concentric rings. This makes it easy to visualize which directories consume the most space.

sudo apt install filelight -y

Launch FileLight:

filelight

To scan a specific directory: Scan ? Scan folder ? Select target directory

Common Use Cases

• System cleanup Identify large directories consuming disk space

• Storage monitoring Regular checks of critical directories like /var, /home

• Backup planning Determine space requirements before creating backups

• Performance optimization Find directories causing slow file operations

Conclusion

Linux provides multiple tools for finding directory sizes, from the versatile du command for quick checks to interactive tools like ncdu and GUI applications like QDirStat. Choose the method that best fits your workflow command-line tools for scripting and automation, or GUI tools for visual analysis and exploration.