Filesystem

See Also:

Misc

• detox: Tool for recursive cleanup of file names.

  detox -v -r <directory>
  

• Fast File Deletion:

  perl -e 'for(<*>){((stat)[9]<(unlink))}'
  

• POSIX ACLs:

  getfacl <file>           # List ACLs for file 
  setfacl -m user:joe:rwx dir # Modify ACL
  ls -ld <file>            # Check for active ACL (indicates a "+")
  

• uNetBootin: Create bootable media for any distribution. Most useful with USB sticks.

• rsync - –delete doesn’t work: It happens when you call rsync without a trailing slash in the source path like this:

  rsync -az -e ssh --delete /data server:/data
  

  It just won’t delete anything. It will when running it like this:

  rsync -az -e ssh --delete /data/ server:/data
  

• List physical disk serial number

    # As root
    hdparm -I /dev/sda | grep Serial
    lshw -class disk
    smartctl -i /dev/sda
    lsblk --nodeps -o name,serial
  
    # As user
    /sbin/udevadm info --query=property --name=sda |grep SERIAL
  

• Debug drive events

    udevadm monitor            # Track any changes
  
    udevadm test /devices/pci0000:00/<id>
  

• inotify - Detect file access

    apt-get install inotify-tools
  
    inotifywait -m -r /var/log           # Show all activity in all subdirs
    inotifywait -m -e create -r /data    # Show all file/dir creations
    inotifywait -m -e isdir -r /data     # Show all subdir accesses (e.g. before mkdir)
  
    inotifywait -m /var/log/auth.log     # Show all access to single file
  

• losetup

  losetup /dev/loop0 <disk image>      # Create
  losetup -e /dev/loop0 <disk image>   # Create with encryption
  losetup /dev/loop0          # Get info on loop0
  losetup -d /dev/loop0           # Detach
  losetup -a              # List used loop devices
  

• dm-crypt with/without LUKS

Automated Sync

Synching without a distributed filesystem

• lsyncd: inotify based rsync daemon

  lsyncd -rsync /home remotehost.org::share/ 
  

  Or in foreground

  lsyncd -nodaemon -log all -rsyncssh <local dir> <remote host> <remote dir>
  

Distributed Filesystems

Cloud/SaaS

SSD Erase

hdparm --user-master u --security-set-pass ctmagazin /dev/sdX
hdparm --user-master u --security-erase ctmagazin /dev/sdX