What are common df options?

The df command in Linux comes with several options that enhance its functionality and output. Here are some of the most common options:

-h: Human-readable format. Displays sizes in KB, MB, or GB, making it easier to understand.
```
df -h
```
-T: Displays the filesystem type along with the disk usage information.
```
df -T
```
-i: Shows inode usage instead of block usage. This is useful for checking how many files can be created on a filesystem.
```
df -i
```
-a: Includes all filesystems, even those that are not currently mounted.
```
df -a
```
-t <type>: Limits the output to filesystems of a specific type (e.g., ext4, nfs).
```
df -t ext4
```
-x <type>: Excludes filesystems of a specific type from the output.
```
df -x tmpfs
```
--total: Displays a total summary of all filesystems at the end of the output.
```
df --total
```
-k: Displays sizes in kilobytes (default behavior).
```
df -k
```
-m: Displays sizes in megabytes.
```
df -m
```

Example Usage

To see a human-readable summary of all mounted filesystems with their types, you can combine options:

df -hT

These options allow you to customize the output of the df command to suit your needs, making it a versatile tool for monitoring disk usage. If you have any further questions or need examples, feel free to ask!