du(1) — Commands
NAME
du − Displays a summary of disk usage
SYNOPSIS
du [-a | -s] [-klrx] [file ...] [directory ...]
The du command gives the number of blocks in all directories (listed recursively) within each specified directory.
FLAGS
-aDisplays disk use for each file. Without -a, du does not report on files.
-sDisplays only the grand total for each of the specified directories, or for a file if used with -a.
-kDisplays block count in kilobytes instead of multiples of 512 bytes.
-lAllocates blocks, in files with multiple links, evenly among the links. By default, a file with two or more links is counted only once.
-rDisplays an error message when du encounters an inaccessible directory, or an inaccessible file when used with -a.
-xDisplays information about only the specified file system. For example, if you want to display information about only the root file system, specify both the −x flag and the root file system (/).
DESCRIPTION
When the -a flag is specified, du reports the number of blocks in individual files. The block count includes the indirect blocks of each file and is in 512-byte units, independent of the cluster size used by the system. If no file or directory name is provided, the du command uses the current directory.
NOTES
If too many files are distinctly linked, du counts the excess files more than once.
EXAMPLES
To display the disk usage of a directory tree and each of its subtrees, enter:
du /u/fran
The previous command displays the number of disk blocks in the /u/fran directory and each of its subdirectories.
To display the disk usage of each file, enter:
du -a /u/fran
The previous command displays the number of disk blocks contained in each file and subdirectory of /u/fran. The number beside a directory is the disk usage of that directory tree. The number beside a regular file is the disk usage of that file alone.
To display only the total disk usage of a directory tree, enter:
du -rs /u/fran
The previous command displays only the sum total disk usage of /u/fran and the files it contains (-s). The -r flag tells du to display an error message if it cannot read a file or directory.
To restrict the disk usage information to the root (/) file system, enter:
du -x /
The previous command displays information only about the root file system and does not display information about the file systems located under the root file system.