Add or remove runscript into directory, specified by SVDIR environment variable. For a list of supported
runscripts see below. These runscripts are too site-specific, so it is impossible to put them into binary
package.
If SVDIR is not set and current user is not root, then ~/.service directory is used. If current user is
root, SVDIR defaults to /etc/service.unprivileged
Makes sense only when invoked by root. Create a service named unprivileged.USER ; the service controls a
runsvdir instance that belongs to the specified USER and supervises sevices linked in USER's~/.service
directory.