du

Disk Usage - report the amount of disk space used by the specified files and for each subdirectory.

Syntax
      du [options]... [file]...

With no arguments, 'du' reports the disk space for the current directory. Normally the disk space is printed in units of 1024 bytes, but this can be overridden

Options

   -a
   --all
      Show counts for all files, not just directories.

   -b
   --bytes
      Print sizes in bytes, overriding the default block size.

   -c
   --total
      Print a grand total of all arguments after all arguments have been processed.
      This can be used to find out the total disk usage of a given set of files or directories.
     

   -D
   --dereference-args
      Dereference symbolic links that are command line arguments. Does not affect other symbolic links. 
      This helps to find the disk usage of directories, such as '/usr/tmp', which are often symbolic links.

   -h
   --human-readable
      Append a size letter such as 'M' for megabytes to each size.
      Powers of 1024 are used, not 1000; 'M' stands for 1,048,576 bytes.
      Use the '-H' or '--si' option if you prefer powers of 1000.

   -H
   --si
      Display size with a non-standard suffixes as follows:
      B=Byte, K=kilobyte, M=megabyte, G=gigabyte, T=teraByte and P=petabyte.

      Powers of 1000 are used, not 1024; so 'M' stands for 1,000,000 bytes.
      Use the '-h' or '--human-readable' option if you prefer powers of 1024.

   -k
   --kilobytes
      Print sizes in 1024-byte blocks, overriding the default block size.

   -l
   --count-links
      Count the size of all files, even if they have appeared already (as a hard link).

   -L
   --dereference
      Dereference symbolic links (show the disk space used by the file or directory that
      the link points to instead of the space used by the link).

   --max-depth=MAX_DEPTH
      Show the total for each directory (and file if -all) that is at most MAX_DEPTH levels
      down from the root of the hierarchy.  The root is at level 0, so 'du --max-depth=0'
      is equivalent to 'du -s'.

   -m
   --megabytes
      Print sizes in megabyte (that is, 1,048,576-byte) blocks.

   -s
   --summarize
      Display only a total for each argument.

   -S
   --separate-dirs
      Report the size of each directory separately, not including the sizes of subdirectories.

   -x
   --one-file-system
      Skip directories that are on different filesystems from the one that the argument being processed is on.

   --exclude=PAT
      When recursing, skip subdirectories or files matching PAT.
      For example, 'du --exclude='*.o'' excludes files whose names end in '.o'.

   -X FILE
   --exclude-from=FILE
      Like '--exclude', except take the patterns to exclude from FILE, one per line.
       If FILE is '-', take the patterns from standard input.

On BSD systems, 'du' reports sizes that are half the correct values for files that are NFS-mounted from HP-UX systems. On HP-UX systems, it reports sizes that are twice the correct values for files that are NFS-mounted from BSD systems. This is due to a flaw in HP-UX; it also affects the HP-UX 'du' program.

Examples

List the total files sizes for everything 1 directory (or less) below the currrent directory ( . )

[simon@testserver]$ du -hc --max-depth=1 .
400M ./data1
1.0G ./data2
1.3G .
1.3G total

List the 10 largest subdirectories in the current directory:

du -hs */ | sort -hr | head

Display the 10 largest subdirectories of the current folder, each with its human redable size:

du -k * | sort -nr | cut -f2 | xargs -d '\n' du -sh | head -n 10

Display folder sizes, to a depth of 2, starting from the home directory (~):

du -ch --max-depth=2 ~

"Never go to a doctor whose office plants have died" ~ Erma Bombeck

Related linux commands:

ls - List information about files.
Equivalent Windows command: DIRUSE - resource kit utility to show size of multiple subfolders.


 
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