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fsck — Check the integrity of a filesystem or repair it. The filesystem should be unmounted at the time the

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thecommandrepairintegrityclifilesystemcheckfsck
macos

Problem

How to use the fsck command: Check the integrity of a filesystem or repair it. The filesystem should be unmounted at the time the command is run. It is a wrapper that calls fsck_hfs, fsck_apfs, fsck_msdos, fsck_exfat, and fsck_udf as needed. More information: <https://keith.github.io/xcode-man-pages/fsck.8.html>.

Solution

fsck — Check the integrity of a filesystem or repair it. The filesystem should be unmounted at the time the command is run. It is a wrapper that calls fsck_hfs, fsck_apfs, fsck_msdos, fsck_exfat, and fsck_udf as needed. More information: <https://keith.github.io/xcode-man-pages/fsck.8.html>.

Check filesystem /dev/sdX, reporting any damaged blocks:
fsck {{/dev/sdX}}


Check filesystem /dev/sdX only if it is clean, reporting any damaged blocks and interactively letting the user choose to repair each one:
fsck -f {{/dev/sdX}}


Check filesystem /dev/sdX only if it is clean, reporting any damaged blocks and automatically repairing them:
fsck -fy {{/dev/sdX}}


Check filesystem /dev/sdX, reporting whether it has been cleanly unmounted:
fsck -q {{/dev/sdX}}

Code Snippets

Check filesystem `/dev/sdX`, reporting any damaged blocks

fsck {{/dev/sdX}}

Check filesystem `/dev/sdX` only if it is clean, reporting any damaged blocks and interactively letting the user choose to repair each one

fsck -f {{/dev/sdX}}

Check filesystem `/dev/sdX` only if it is clean, reporting any damaged blocks and automatically repairing them

fsck -fy {{/dev/sdX}}

Check filesystem `/dev/sdX`, reporting whether it has been cleanly unmounted

fsck -q {{/dev/sdX}}

Context

tldr-pages: osx/fsck

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