Команда DF на Raspberry Pi Zero 2 W¶

Overview¶

The df command in Linux is used to report file system disk space usage. On the Raspberry Pi Zero 2 W running Raspberry Pi OS, it’s an essential tool to check available storage.

It shows how much space is used, available, and where the file systems are mounted.

Basic Syntax¶

df [OPTIONS] [FILESYSTEM]

Examples on Raspberry Pi¶

Basic Usage

This command shows all mounted file systems and their disk usage:

df

Sample Output:

Filesystem     1K-blocks    Used Available Use% Mounted on
/dev/root        7224064 2765484   4103292  41% /
devtmpfs          427508       0    427508   0% /dev
tmpfs             464620       0    464620   0% /dev/shm
tmpfs             464620    6668    457952   2% /run
/dev/mmcblk0p1    258095   54730    203365  22% /boot

Explanation of Columns¶

Filesystem: Device or partition.
1K-blocks: Total size in 1K blocks.
Used: Space used.
Available: Free space.
Use%: Percentage of space used.
Mounted on: Directory where the filesystem is mounted.

Useful Options¶

Show in Human-Readable Format

Use -h to display sizes in KB, MB, or GB:

df -h

Example Output:

Filesystem      Size  Used Avail Use% Mounted on
/dev/root       6.9G  2.7G  3.9G  41% /
/dev/mmcblk0p1  252M   54M  198M  22% /boot

Display Specific File System

You can also check a specific mount point:

df -h /boot

Show File System Type

Add -T to include file system type:

df -T

Combine Options

Combine options to show file system type and use human-readable format:

df -hT

Filesystem     Type  Size  Used Avail Use% Mounted on
/dev/root      ext4  6.9G  2.7G  3.9G  41% /
/dev/mmcblk0p1 vfat  252M   54M  198M  22% /boot

Batch Scripting Use¶

The df command is useful in scripts to check for low disk space:

if df / | awk 'NR==2 {exit ($5+0 >= 90)}'; then
    echo "Warning: disk usage above 90%!"
fi

Tip for Raspberry Pi Users¶

On Raspberry Pi Zero 2 W with limited SD card storage, regularly checking disk space with df -h helps prevent system issues caused by a full root partition.

`df` vs `du`¶

df shows disk usage at the file system level.
du shows disk usage for individual files and directories.

`df` means: “Disk Free”¶

Fun fact: the name stands for disk free, and it’s been a Unix tool for decades!

df helps you stay in control of your Pi’s storage!