Create file of size

Sometimes, I need a file of a certain size to test something out. Turns out there is a simple utility you can use from terminal.

mkfile 1g test-image.jpg

NAME
       mkfile - create a file

SYNOPSIS
       mkfile [ -nv ] size[b|k|m|g] filename ...

DESCRIPTION
       mkfile  creates  one  or more files that are suitable for use as NFS-mounted swap areas.  The sticky bit is set, and
       the file is padded with zeroes by default.  Non-root users must set the sticky bit using chmod(1).  The default size
       unit  is  bytes,  but  the  following  suffixes  may  be  used to multiply by the given factor: b (512), k (1024), m
       (1048576), and g (1073741824).

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.

WARNING
       If  a  client's  swap file is removed and recreated, it must be re-exported before the client will be able to access
       it.  This action may only be done when the client is not running.

SEE ALSO
       chmod(2), stat(2), sticky(8)