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Written by Oleksandr Gavenko (AKA gavenkoa), compiled on 2017-01-30 from rev ccaa2f364422+.

File system.

Supported FS.

List of supported by current Linux kernel FSes:

$ cat /proc/filesystems

FS stats

Free space:

$ df

Free space in MB:

$ df -m

Free space in human readable format:

$ df -h

Number of free nodes:

$ df -i

FS limits

ext4 uses 32-bit inode numbers so number of files limited to 2^32.

fs name inode sub-dir file fs total
ext2 255     2 TiB 16 TiB
ext3 255   32000 2 TiB 16 TiB
ext4 255 2^32 64000 16 TiB 16 TiB
btrfs 255 2^64
16 EiB 16 EiB
fat32 255 268e+6 2^16 2 GiB 8 TiB
ntfs 255 2^32 2^32 16 TiB 256 TiB
xfs 255     100 TiB 100 TiB
gfs2 255     100 TiB 100 TiB
https://en.wikipedia.org/wiki/Comparison_of_file_systems#Limits
FS limits.

Make label on FAT32 volume.

The volume name can be up to 11 characters long:

$ sudo mlabel -i /dev/<device> ::my-label

or when create FAT32 file system:

$ sudo mkdosfs -n <vol-name> /dev/<device>

Convert file name coding.

$ convmv --nosmart -f cp-1251 -t utf-8 -r $dir

How get file time attributes.

POSIX define 3 file time attributes: atime (access time, only a few OS/fs update this parameter), ctime (attribute/inode modification time), mtime (modification time).

To get time you can use 'ls' command but it print time in locale dependent irregular form:

$ ls -l file.txt      # last file modification
$ ls -lc file.txt     # last file status modification
$ ls -lu file.txt     # last access

GNU coreutils provide more robust 'stst' utility:

$ stat -c %Y file.txt # last file modification
$ stat -c %Z file.txt # last file status modification
$ stat -c %X file.txt # last access

POSIX file name restriction.

Windows file name restriction.

http://msdn.microsoft.com/en-us/library/aa365247.aspx
Naming Files, Paths, and Namespaces

How get UUID and label?

Include UUID (Universally Unique Identifier) and labels:

$ ls -l /dev/disk/by-uuid/
lrwxrwxrwx 1 root root 10 2010-11-01 23:41 46B6-1FD4 -> ../../sdb2
lrwxrwxrwx 1 root root 10 2010-11-01 23:41 4C30299030298256 -> ../../sda1

$ ls -l /dev/disk/by-label/
lrwxrwxrwx 1 root root 10 2010-11-01 23:41 bin -> ../../sda3
lrwxrwxrwx 1 root root 10 2010-11-01 23:41 inst -> ../../sda2
lrwxrwxrwx 1 root root 10 2010-11-01 23:41 media -> ../../sdc5

$ sudo vol_id /dev/dm-2
ID_FS_USAGE=filesystem
ID_FS_TYPE=ext3
ID_FS_VERSION=1.0
ID_FS_UUID=f7484fc9-75ec-4e46-8539-50b1e371b7ef
ID_FS_UUID_ENC=f7484fc9-75ec-4e46-8539-50b1e371b7ef
ID_FS_LABEL=
ID_FS_LABEL_ENC=
ID_FS_LABEL_SAFE=

$ /sbin/blkid     ## from 'e2fsprogs' package
/dev/sdc2: UUID="46B6-1FD4" TYPE="vfat"
/dev/sdb2: TYPE="ntfs" UUID="BC48D3FD48D3B47C" LABEL="inst"
/dev/sda5: UUID="5240AED140AEBB5D" LABEL="music" TYPE="ntfs"
/dev/sdc1: UUID="81c4444f-0b70-429a-9d97-8c13e8651f5b" TYPE="ext3"
/dev/sdc3: UUID="KOpHWz-clDR-2MqV-vAkE-cPvY-uZrY-kjYJIb" TYPE="lvm2pv"

$ udevinfo --query=all --name /dev/sdb    ## from 'udev' package
P: /block/sdb
N: sdb
S: disk/by-id/ata-WDC_WD1600JS-00MHB0_WD-WCANM5835587
S: disk/by-id/scsi-SATA_WDC_WD1600JS-00_WD-WCANM5835587
S: disk/by-path/pci-0000:00:08.0-scsi-1:0:0:0
E: ID_VENDOR=ATA
E: ID_MODEL=WDC_WD1600JS-00M
E: ID_REVISION=02.0
...

How set UUID and label?

For ext2/ext3 fs:

$ sudo tune2fs /dev/hdb1 -U `uuid`

Linux fs under Windows.

Ext2Fsd.

Ext2Fsd is an open source linux ext3/ext4 file system driver for Windows systems (NT/2K/XP/Win7/Win8, X86/AMD64) and only alive project.

http://www.ext2fsd.com/
Home page.
http://sourceforge.net/projects/ext2fsd/
Sourceforge home page.

Ext2 IFS.

It provides Windows NT4.0/2000/XP/2003/Vista/2008 with full access to Linux Ext2 volumes (read access and write access). This may be useful if you have installed both Windows and Linux as a dual boot environment on your computer.

The "Ext2 Installable File System for Windows" software is freeware.

After install use 'ifsdrives.cpl' control panel to modify settings.

http://www.fs-driver.org/
home page

rfstool.

Allows you to access ReiserFS partitions from a Windows 95/98/ME/NT/2000/XP system. It also allows you to access ReiserFS partitions from Linux. It is a complete rewrite of the ReiserFS functions needed to list directories, copy files, and backup metadata.

http://p-nand-q.com/e/reiserfs.html
home page
http://freshmeat.net/projects/rfstool/
Freshmeat home page.

Summary files size.

$ find . -type f -iname "*.log" -print0 | du --files0-from=- -c -m | tail -n 1 \
    | (read first rest; echo $first)

Mount NTFS in Linux.

Mount in rw mode:

$ man 8 ntfs-3g
$ cat /etc/fstab
...
UUID=D474CB9874CB7C2C /mnt/winbin ntfs-3g rw,default_permissions,gid=1000,fmask=113,dmask=002,noatime,silent 0 0
...

Stop fsck running every 27 boots.

Check current settings:

$ tune2fs -l /dev/$DISK

and tune them:

$ tune2fs -c 0 /dev/$DISK
$ tune2fs -i 2w /dev/$DISK

Or disable checks in /etc/fstab completely (by setting last colon to 0 value)!