Export mounted filesystems as JSON
Build a paste-ready command, then review its compatibility and effects before running it.
findmnt -J -o TARGET,SOURCE,FSTYPE,OPTIONSread-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementsfindmntfindmnt must be installed and available on PATH.
Version supportfindmnt Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signals{"filesystems":[{"target":"/","source":"/dev/sda2","fstype":"ext4","options":"rw,relatime"}]}Representative successful output; values vary with the selected target and system state.
Known errorsfindmnt: command not foundfindmnt is missing or is not available on PATH.
Verifyfindmnt -J -o TARGET,SOURCE,FSTYPE,OPTIONSThe output matches the expected target and exits without an error.Rollback noteNot required: this command is read-only and does not change system state.
Command breakdown
01findmntCommandRuns the findmnt stage of this one-liner.
02-JOptionConfigures findmnt with the -J option.
03-oOptionSelects an output file or output format for this command.
04TARGET,SOURCE,FSTYPE,OPTIONSArgumentPasses TARGET,SOURCE,FSTYPE,OPTIONS to findmnt.
Example input
findmnt -J -o TARGET,SOURCE,FSTYPE,OPTIONS
Example output
{"filesystems":[{"target":"/","source":"/dev/sda2","fstype":"ext4","options":"rw,relatime"}]}
Illustrative output — exact values vary by system and data.
Official sources