How do I list all mounted filesystems?

Use 'findmnt' without any arguments to display all mounted filesystems in a tree structure, or use 'findmnt -l' for a list format.

findmnt Command in Linux - Find Mounted Filesystems

Syntax

                        findmnt [options] [device|mountpoint]
                        findmnt [options] -t type
                        findmnt [options] -S source
                    

The findmnt command displays information about mounted filesystems in a tree-like format, showing mount points, device names, filesystem types, and mount options.

Basic Usage

List all mounted filesystems

                        # Show all mounted filesystems in tree format
                        findmnt
                        
                        # Show in list format
                        findmnt -l
                        
                        # Show with additional details
                        findmnt -D
                    

Display all mounted filesystems with their hierarchy and properties

Find specific mount point

                        # Find mount point for a specific directory
                        findmnt /home
                        findmnt /var
                        
                        # Find mount point for root filesystem
                        findmnt /
                    

Locate specific mount points and their associated devices

Find by device

                        # Find mount point for a specific device
                        findmnt /dev/sda1
                        findmnt /dev/nvme0n1p1
                        
                        # Find by UUID
                        findmnt UUID="1234-5678"
                    

Find where a specific device is mounted

Common Options

Output format options

                        # Tree format (default)
                        findmnt
                        
                        # List format
                        findmnt -l
                        
                        # JSON format
                        findmnt -J
                        
                        # Export format
                        findmnt -E
                    

Choose different output formats for different use cases

Filtering options

                        # Filter by filesystem type
                        findmnt -t ext4
                        findmnt -t nfs
                        findmnt -t tmpfs
                        
                        # Filter by source
                        findmnt -S /dev/sda1
                        findmnt -S LABEL="ROOT"
                        
                        # Filter by mount point
                        findmnt -T /home
                    

Filter results by various criteria

Information display

                        # Show detailed information
                        findmnt -D
                        
                        # Show mount options
                        findmnt -o
                        
                        # Show filesystem information
                        findmnt -i
                    

Display additional information about mounts

Practical Examples

System administration tasks

                        # Check all mounted filesystems
                        findmnt
                        
                        # Find specific filesystem type
                        findmnt -t ext4
                        
                        # Check if a directory is on a separate partition
                        findmnt /home
                        
                        # Find all NFS mounts
                        findmnt -t nfs
                        
                        # Check mount options for root
                        findmnt -o /
                    

Common administrative tasks using findmnt

Scripting and automation

                        # Get device name for a mount point
                        findmnt -n -o SOURCE /home
                        
                        # Get filesystem type
                        findmnt -n -o FSTYPE /var
                        
                        # Check if device is mounted
                        if findmnt /dev/sda1 >/dev/null 2>&1; then
                            echo "Device is mounted"
                        else
                            echo "Device is not mounted"
                        fi
                    

Use findmnt in scripts and automation

Best Practices

findmnt Best Practices

Use tree format for overview, list format for scripting
Combine with grep for complex filtering
Use JSON output for programmatic parsing
Check mount options for security implications
Verify filesystem types before operations
Use in combination with mount and umount commands

Common Pitfalls

Permission issues - Some information may require root access
Output parsing - Tree format can be complex to parse
Device names - Device names may change between reboots
Network filesystems - May show different information than local filesystems
Mount options - Complex mount options may be truncated

findmnt Command