System administration command. Checks and repairs a disk, as does fsck, but specifically designed for ext2 (Linux Second Extended) and ext3 (Third Extended, a journaling version of ext2) filesystems. fsck actually uses this command when checking ext2 and ext3 filesystems. Most often used after a sudden shutdown, such as from a power outage, or when damage to the disk is suspected.
Use superblock instead of the default superblock.
Expect to find the superblock at size; if it’s not there, exit.
Find bad blocks using the badblocks command. Specify this option twice to perform the scan with a nondestructive read-write test.
Write completion information to the specified filedescriptor. If 0, print a completion bar.
Optimize directories by reindexing, sorting, and compressing them where possible.
Force checking, even if kernel has already marked the filesystem as valid. e2fsck will normally exit without checking if the system appears to be clean.
Flush buffer caches before checking.
Use the specified external journal file.
Preserve all previously marked bad blocks when using the -c option.
Consult file for a list of bad blocks, in addition to checking for others.
Consult file for list of bad blocks instead of checking filesystem for them.
Ensure that no changes are made to the filesystem. When queried, answer “no.”
“Preen.” Repair all ...