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Filesystem Maintence

Utilities

QuestionAnswer
Display free space in the partition holding specifies directory df
df Options: Human readable format (bytes, KB, MB, GB) df -h
df Options: inode info df -i
df Options: Limit list to Local file system df -l
df Options: Displays filesystem type info df -T, or --print-type
Displays FILES and FILE SIZES in a below a specified directory (recursive by nature) du
du Options: Lists a total amount of space taken up for the directory du -c
du Options: Human readable format (bytes, KB, MB, GB) du -h
du Options: Lists only the total, not each file du -s
Displays open files in file system lsof
lsof Options: Lists all files for processes that are executing the specified command lsof -c Command _Name
lsof Options: List open files owned by the specified user lsof -u
lsof Options: Lists files opened by a specific process lsof -g process_ID
lsof Options: Recursively list files in a directory lsof +D directory_name
lsof Options: Size of files lsof --s
Display the PID’s of processes that are accessing a specified file or file system fuser
fuser Options: Displays all process ID’s fuser -a
fuser Options: Extended information (verbose) fuser -v
fuser Options: Appends the username to each process ID fuser -u
fuser Options: Displays process IDs in a specified directory fuser -m
Checks and optionally repair one or more Linux file systems – must be unmounted fsck
fsck Options: Serializes fsck when multiple filesystems are checked fsck -s
fsck Options: File type of file system to be checked fsck -t fsck -t ext2 /dev/sdb1
fsck Options: Automatically repairs without any questions fsck -a
fsck Options: Prompts for confirmation when errors found and asks permissions to fix errors fsck -r
Checks and optionally repair a 2nd extended file system (ext2) or ext2 file systems containing a journal (ext3) e2fsck
e2fsck Options: Forces a file system check even if filesystem appears clean e2fsck -f
e2fsck Options: Open filesystem as read-only and answer all question as “no” e2fsck -n
e2fsck Options: Repair without any questions e2fsck -p
e2fsck Options: Yes to all questions e2fsck -y
e2fsck Options: Use an alternative superblock id the primary superblock is corrupt e2fsck -b
Debugs the file system – examines and changes state of an ext2, ext3, or ext4 file debugfs
Allows administrators to unlink directories, change inode blocks, find all inodes that point to a block, and several other similar functions debugfs
debugfs Options: File system should be opened in read-write mode debugfs -w
debugfs Options: Open in catastrophic mode debugfs -c
debugfs Options: Executes commands in a text file debugfs -f
Print super block info for an ext2, ext3 or ext4 file system – info about each sector on partition about sector type, inode info, free blocks dumpe2fs
dumpe2fs Options: Print blocks reserved as bad in the file system dumpe2fs -b
dumpe2fs Options: Print only super block info dumpe2fs -h
dumpe2fs Options: Prints group info block numbers in hexadecimal format dumpe2fs -x
dumpe2fs Options: Force the utility to display the filesystem status irrespective of the filesystem flags dumpe2fs -f
Adjusts tunable parameters on ext2, ext3, and ext4 file systems – parameters include – volume label, reserved blocks, inode size, and journaling tune2fs
Implement access control – converts filesystem from ext2 to ext3 without affecting data on the drive tune2fs
tune2fs Options: Adjust the number of mounts after which the file system will be checked tune2fs -c
tune2fs Options: Remounts the filesystem as read-only tune2fs -e remounts-ro
tune2fs Options:Remount in PANIC mode tune2fs -e panic
tune2fs Options: Enables Posix access control list tune2fs -o acl
tune2fs Options: Converts ext2 file system to ext3 filesystem tune2fs –j /dev/sdb1 (without affecting data on drive) tune2fs -j
tune2fs Options: Specify the max time interval between filesystem checks (days, months, or weeks) tune2fs -i d/mw
tune2fs Options: Specify number of times filesystem can be mounted tune2fs -C mount count
tune2fs Options: List the contents within the superblock of the filesystem tune2fs -l
Display the XFS file system parameters, such as block size and inode structures – the same as xfs_grow –n xfs_info
Expand the xfs filesystem to fill the disk size xfs_grow
Repairs and recover a corrupt xfs filesystem xfs_repair
Debug the xfs filesystem xfs_db
Copy (dump) the metadata from an XFS filesystem to a file – does not alter the file system xfs_metadump
Use xfs_metadump to dump only: Unmounted, read-only, or frozen filesystems
xfs_metadump Options: Stop dumping the file system if there is a read error xfs_metadump -e
xfs_metadump Options:Displays the dump process xfs_metadump -g
xfs_metadump Options: Disables obfuscation of the file names and extended attributes xfs_metadump -o
Created by: johnadream