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mkfile creates one or more files that are suitable for use as NFS- mounted swap areas, or as local swap areas. When a root user executes mkfile(), the sticky bit is set and the file is padded with zeros by default. When non-root users execute mkfile(), they must manually set the sticky bit using chmod(1) . The default size is in bytes, but it can be flagged as kilobytes, blocks, or megabytes, with the k, b, or m suffixes, respectively.