Disk and File System Management

Question 1

lsblk

Answer 1

A tool to list block devices.

-f: filesystem info included, UUID.

Question 2

fdisk

Answer 2

An MBR command to create MBR partitions. 
p: partition in table
m: help
n: new partition
    (enter to accept defaults)
    p: primary
    e: extended
    Add partition # 
    sector location or size of partition
w: write file system table to disk

Question 3

parted

Answer 3

An more MBR and GPT app to list partitions
help: lists all commands
p: print partition info
mklabel : adds label for type
mkpart: needs  ,

Question 4

gdisk

Answer 4

fdisk-styled for GPT.

?: For help.

Question 5

mkswap

Answer 5

NEEDS AN EXISTING SWAP ID PARTITION TO USE
Formats partition for use as swap space
-L: label add

Question 6

swapon

Answer 6

Enables swap spaces
Swapoff disables
/etc/fstab example
LABEL=SWAP swap swap defaults 0 0
-a: all in /etc/fstab
-U: by UUID
-L: by label

Question 7

mkfs

Answer 7

Adds file system to specified partition
-t or .
-L
Note: can get UUID via blkid

Question 8

df

Answer 8

Shows available disk space on file system. (disk free)
lkblock, used, available, %, mounted on.
-i: shows inode info per directory
-h: human
—total: shows total for all file sys.

Question 9

du

Answer 9

Shows used space (disk used)
—inodes: shows inode info for each directory and sub directory
-h: human
—max-depth=: shows down to directories in.
-s: summary of spaces used in directory.

Question 10

fsck

Answer 10

File system check utility to run on unmounted devices. Configured in /etc/fstab. Specify device like in fstab.
-r: report

Question 11

e2fsck

Answer 11

ext2,3,4 specific utility. Can also display file system journal

• f: force to rerun
• p: repair file system

Question 12

mke2fs

Answer 12

Creates new ext2,3,4 file system.

Question 13

mke2fs.conf

Answer 13

Lists defaults for file systems

• t: type
• L: label

Question 14

tune2fs

Answer 14

Adjusts parameters, lost&found for recovery

• l: lists parameters
• i: interval for times checked

Question 15

Various xfs tools

Answer 15

xfs_repair: similar to e2fsck
xfs_sfr: recognizes data stored in blocks. Similar to defrag
xfs_db: debugging tool
    Frag = fragmentation
    Freesp = free space on device

Question 16

mount

Answer 16

W/o extra lists every mount point on system.
-a: auto
-h: help
-t: type
-o: options. Same as fstab
    auto: any time -a used
Refer to S18 for options.