systemd-tmpfiles — Creates, deletes and cleans up volatile and temporary files and directories.
systemd-tmpfiles [OPTIONS...]  [CONFIGURATION FILE...] 
systemd-tmpfiles creates,
                deletes and cleans up volatile and temporary files and
                directories, based on the configuration from
                /etc/tmpfiles.d/. See
                tmpfiles.d(5)
                for more details on these files.
If invoked with no arguments applies all
                directives from all configuration files in
                /etc/tmpfiles.d/*.conf. If one or
                more absolute file names are passed on the command
                line only the directives in these files are
                applied.
The following options are understood:
--createIf this option is passed all files and directories marked with f, F, d, D in the configuration files are created. Files and directories marked with z, Z have their ownership, access mode and security labels set.
--cleanIf this option is passed all files and directories with an age parameter configured will be cleaned up.
--removeIf this option is passed all files and directories marked with r, R in the configuration files are removed.
--prefix=PATHOnly apply rules that apply to paths with the specified prefix.
--helpPrints a short help text and exits.
It is possible to combine
                --create, --clean,
                and --remove in one invocation. For
                example, during boot the following command line is
                executed to ensure that all temporary and volatile
                directories are removed and created according to the
                configuration file:
systemd-tmpfiles --remove --create