Provided by: util-linux_2.19.1-2ubuntu3_i386 fstrim - discard
unused blocks on a mounted filesystem fstrim [-o offset] [-l
length] [-m minimum-extent] [-v] mountpoint fstrim is used on a
mounted filesystem to discard (or "trim") blocks which are not
in use by the filesystem. This is useful for solid-state drives
(SSDs) and thinly-provisioned storage. By default, fstrim will
discard all unused blocks in the filesystem. Options may be used
to modify this behavior based on range or size, as The
mountpoint argument is the pathname of the directory where the
filesystem is mounted. The offset, length, and minimum-free-
extent arguments may be followed by binary (2^N) suffixes KiB,
MiB, GiB, TiB, PiB and EiB (the "iB" is optional, e.g. "K" has
the same meaning as "KiB") or decimal (10^N) suffixes KB, MB,
GB, PB and EB. Print help and exit. -o, --offset offset Byte
offset in filesystem from which to begin searching for free
blocks to discard. Default value is zero, starting at the
beginning of the filesystem. -l, --le