Check an ext filesystem without writing
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read-onlyno known side effects Compatibility
LinuxVerified for Linux using posix, bash, zsh syntax.
Operational knowledgereview due 2027-01-20
Requirementse2fscke2fsck must be installed and available on PATH.
Version supporte2fsck Current supported releasesVerified for linux using posix, bash, zsh syntax; consult compatibility notes for platform-specific differences.
Expected signalsPass 1: Checking inodes, blocks, and sizesRepresentative successful output; values vary with the selected target and system state.
Known errorse2fsck: command not founde2fsck is missing or is not available on PATH.
Verifye2fsck -fn {{device}}The 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
01e2fsckCommandRuns the e2fsck stage of this one-liner.
02-fnOptionConfigures e2fsck with the -fn option.
03<device>ParameterA value supplied in the Fill parameters section.
Example input
e2fsck -fn /dev/sda
Example output
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
/dev/sda2: clean, 184231/6553600 files, 8120331/26214400 blocks
Illustrative output — exact values vary by system and data.
Official sources