Display disk usage statistics.
Lists the file system usage for individual files, if a folder argument is passed argument, du will list usage for each sub folder in that hierarchy. If no file is specified, the current folder (hierarchy) is displayed.
Syntax du [-H | -L | -P] [-a | -s | -d depth] [-c] [-h | -k | -m | -g] [-x] [-I mask] [file ...] Options -H Symbolic links on the command line are followed, symbolic links in file hierarchies are not followed. -L Symbolic links on the command line and in file hierarchies are followed. -P No symbolic links are followed (default) -a Display an entry for each file in a file hierarchy. -s Display an entry for each specified file. (Equivalent to -d 0) -d depth Display an entry for all files and folders depth folders deep. -h "Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte -k KB Display block counts in 1024-byte (1-Kbyte) blocks. -m MB Display block counts in 1048576-byte (1-Mbyte) blocks. -g GB Display block counts in 1073741824-byte (1-Gbyte) blocks. -r Generate any read error messages, on by default, this option exists solely for conformance with X/Open Portability Guide 4 -c Display a grand total. -x File system mount points are not traversed. -I mask Ignore files and folders matching the specified mask.
The du utility counts the storage used by symbolic links and not the files they reference unless the -H or -L option is specified. If either the -H or -L options are specified, storage used by any symbolic links which are followed is not counted or displayed.
Files having multiple hard links are counted (and displayed) a single time per du execution.
If the -k flag is specified, the number of 1024-byte blocks used by the file is displayed, otherwise getbsize(3) is used to determine the preferred block size. Partial numbers of blocks are rounded up.
List files and folders - totalling the size to include subfolders:
du -sk * | sort -nr
List folders and hidden (system folders) - totalling the size to include subfolders:
du -d 1 . | sort -nr
If the environment variable BLOCKSIZE is set, and the -k option is not specified, the block counts will be displayed in units of that size block. If BLOCKSIZE is not set, and the -k option is not specified, the block counts will be displayed in 512-byte blocks. .
“Never go to a doctor whose office plants have died” ~ Erma Bombeck
du man page - Apple.com
df - Display free disk space
ln - Make links between files (hard links, symbolic links)
quota - Display disk usage and limits
open - open a file or folder
fts(3), compat(5), symlink(7), quot(8)
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