1.\" Copyright (c) 1990 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.roff% 5.\" 6.\" @(#)du.1 6.15 (Berkeley) 03/01/92 7.\" 8.Dd 9.Dt DU 1 10.Os 11.Sh NAME 12.Nm du 13.Nd display disk usage statistics 14.Sh SYNOPSIS 15.Nm du 16.Op Fl a Li \&| Fl s 17.Op Fl x 18.Op Ar file ... 19.Sh DESCRIPTION 20The 21.Nm du 22utility displays the file system block usage for each file argument 23and for each directory in the file hierarchy rooted in each directory 24argument. 25If no file is specified, the block usage of the hierarchy rooted in 26the current directory is displayed. 27The number of blocks are in the same units as that returned by the 28.Xr stat 2 29system call, i.e. 512-byte blocks. 30Partial numbers of blocks are rounded up. 31.Pp 32The options are as follows: 33.Bl -tag -width Ds 34.It Fl a 35Display an entry for each file in the file hierarchy. 36.It Fl s 37Display only the grand total for the specified files. 38.It Fl x 39Filesystem mount points are not traversed. 40.El 41.Pp 42If 43.Ar file 44is a symbolic link referencing an existing file, the file referenced 45by the link is reported on instead of the link itself. 46.Pp 47Files having multiple hard links are counted (and displayed) a single 48time per 49.Nm du 50execution. 51.Sh ENVIRONMENTAL VARIABLES 52.Bl -tag -width BLOCKSIZE 53.It Ev BLOCKSIZE 54If the environmental variable 55.Ev BLOCKSIZE 56is set, the block counts will be displayed in units of that size block. 57.El 58.Sh SEE ALSO 59.Xr df 1 , 60.Xr quot 8 61.Sh HISTORY 62A 63.Nm du 64command appeared in 65.At v6 . 66