= Filesystem notes

== Admissible characters for basenames

https://en.wikipedia.org/wiki/Comparison_of_file_systems

FAT32/FAT32X short-filename      [OEM] A-Z, 0-9, ! # $ % & ' ( ) - @ ^ _ ` { } ~, 0x80–0xFF, 0x20
FAT32/FAT32X long-filename       Unicode except NUL, " * / : < > ? \ |
NTFS (Win32)                     any case-insensitive UTF-16 code unit except /\:*"?<>| as well as NUL
NTFS (POSIX)                     any case-  sensitive UTF-16 code unit except / as well as NUL
ext2 & ext3 & ext4               any byte except NUL and I
ZFS                              any Unicode except NUL 
btrfs                            any byte except '/' and NUL

== get filesystem size of current directory

du -sh .

== estimate current FS usage

df -h

== how to use shred

shred -s 80G -u -v -z

== create a bootable Ubuntu USB stick

sudo mkfs.vfat /dev/sdd -I
sudo dd if=xubuntu-*-amd64.iso of=/dev/sdd bs=4MB;sync;eject /dev/sdd