`du': Estimate file space usage =============================== `du' reports the amount of disk space used by the specified files and for each subdirectory (of directory arguments). Synopsis: du [OPTION]... [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 (Note: Block size). The program accepts the following options. Also see Note: Common options. `-a' `--all' Show counts for all files, not just directories. `-b' `--bytes' Print sizes in bytes, overriding the default block size (Note: 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 is helpful for finding out 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' Append a size letter such as `M' for megabytes to each size. (SI is the International System of Units, which defines these letters as prefixes.) Powers of 1000 are used, not 1024; `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 (Note: 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=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.
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