.Dd September 11, 2015 .Dt FALLOCATE 1 .Os ubase .Sh NAME .Nm fallocate .Nd reallocate files .Sh SYNOPSIS .Nm .Op Fl o Ar num .Fl l Ar num .Ar file ... .Sh DESCRIPTION .Nm if necessary creates and reallocates each .Ar file resulting in expansion or truncation. .sp Given the filesystem supports .Xr fallocate 2 , it is a very fast method of reallocation. .Sh OPTIONS .Bl -tag -width Ds .It Fl l Ar num Allocate .Ar num bytes. .It Fl o Ar num Offset allocation by .Ar num bytes. .El .Sh SEE ALSO .Xr fallocate 2