How to create files with arbitary sizes

mkfile allows you to create files with arbitary sizes. This comes in handy if want to test file transfer speeds between two endpoints and you want use a file with an exact size.

The command below let’s you create 100M file.

$ mkfile -n 100M 100M.data

Below the is the syntax for mkfile

Syntax
          mkfile [ -nv ] size[b|k|m|g] filename ...
Options
   -n     Create an empty filename.  The size is noted,  but  disk  blocks
          aren't allocated until data is written to them.

   -v     Verbose.  Report the names and sizes of created files.