CommandLinuxmacOS

fsck

fsck [options] device

Checks a filesystem for consistency errors and repairs them — the standard tool after an unclean shutdown or suspected disk corruption.

// FLAGS

-yautomatically answer "yes" to all repair prompts

-fforce a check even if the filesystem looks clean

-ncheck only, don't repair

// EXAMPLE

fsck -y /dev/sda1 — checks and automatically repairs any errors found on that partition.

// GOTCHA

fsck should never be run on a mounted, in-use filesystem — doing so can cause the exact corruption it's meant to fix; unmount it first, or run it from a live/rescue environment for the root filesystem.

// RELATED COMMANDS

mount lsblk smartctl