Linux e2fsck Command

Linux Command Reference

The Linux e2fsck command is used to check whether the partition using the Linux ext2 file system is working properly.

Syntax

e2fsck [-pacnydfvFV] [-b superblock] [-B blocksize] [-l|-L bad_blocks_file] [-C fd] device

Parameter Description：

• device: The hard disk partition to be checked, e.g., /dev/sda1
• -a: Check the partition and automatically repair if there are problems, equivalent to the functionality of -p.
• -b: Set the location where the superblock is stored.
• -B: Set the size of the unit block.
• -c: Check whether the partition has bad tracks.
• -C file: Save the check results to file for viewing.
• -d: Print e2fsck's debug results.
• -f: Force check.
• -F: Clear the device's buffer cache before starting the check to avoid errors.
• -l bad_blocks_file: Add the block data with bad tracks to bad_blocks_file.
• -L bad_blocks_file: Store the bad track block data in bad_blocks_file; if the file does not exist, it is automatically created.
• -n: Open the file system in read-only mode.
• -p: Check the partition and automatically repair if there are problems.
• -v: Verbose display mode.
• -V: Display the current version of e2fsck.
• -y: Preset all questions during the check to answer "yes".

Examples

Check whether /dev/hda5 is normal. If there are any abnormalities, repair automatically, and set all prompts to answer "yes":

e2fsck -a -y /dev/hda5

Note:

In most cases where e2fsck is used to check a hard disk partition, the situation is usually special. Therefore, it is best to umount the partition first, and then run e2fsck to perform the check. If you must check /, please enter single user mode before running it.

Linux Command Reference