df
From NetBSD Wiki
df(1) displays statistics about the amount of free disk space on the specified file system or on the file system of which file is a part. By default, all sizes are reported in 512-byte block counts. If neither a file or a file system operand is specified, statistics for all mounted file systems are displayed (subject to the -l and -t options below).
% df Filesystem 512-blocks Used Avail Capacity Mounted on /dev/wd0a 16011052 7478572 7731928 49% / kernfs 2 2 0 100% /kern
Use option -h for human readable output. This option is only available on NetBSD > 2.0
% df -h Filesystem Size Used Avail Capacity Mounted on /dev/wd0a 7.6G 3.6G 3.7G 49% / kernfs 1.0K 1.0K 0B 100% /kern
Reserved Space
As you may noticed on the previous df example, 3.6 plus 3.7 does not equal 7.6. Depending on the filesystem you use, there is disk space reserved from normal users, only for root. This is normally 5% on FFS and 10% on LFS. If the reserved space is used, df may displays negative values or values above 100%.
