df Command Examples in Linux¶
Introduction¶
These examples show practical ways to use df on a Linux terminal. Each example is written so you can adapt it for administration or troubleshooting.
Example 1: Basic Usage¶
df
This is the simplest form of the command and is a good starting point before adding options.
Example 2: Common Admin Task¶
df -h
This example reflects a common task on RHEL, Rocky Linux, AlmaLinux, or similar systems.
Example 3: Useful Option¶
df -h /var
This option helps narrow the result, change behavior, or handle a more realistic target.
Example 4: Real-World Scenario¶
df -Th
Use this pattern when the task moves beyond a single basic command.
Example 5: Verification¶
findmnt /var
Example output:
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rhel-root 50G 18G 33G 36% /
Common Mistakes¶
- Confusing filesystem usage from df with directory size from du.
- Ignoring inode exhaustion when block space is still available.
- Checking the wrong mount point after bind mounts or separate filesystems.
Quick Reference¶
df
df -h
df -h /var
df -Th
findmnt /var
Related Guides¶
Summary¶
Good df usage means choosing the right option, keeping the target clear, and verifying the result with output you can explain.