# phpman > info > SYSTEMD-DEBUG-GENERATOR

[SYSTEMD-DEBUG-GENERATOR(8)](https://www.chedong.com/phpMan.php/man/SYSTEMD-DEBUG-GENERATOR/8/markdown)  systemd-debug-generator [SYSTEMD-DEBUG-GENERATOR(8)](https://www.chedong.com/phpMan.php/man/SYSTEMD-DEBUG-GENERATOR/8/markdown)

NAME
       systemd-debug-generator - Generator for enabling a runtime debug shell
       and masking specific units at boot

SYNOPSIS
       /lib/systemd/system-generators/systemd-debug-generator

DESCRIPTION
       systemd-debug-generator is a generator that reads the kernel command
       line and understands three options:

       If the systemd.mask= or rd.systemd.mask= option is specified and
       followed by a unit name, this unit is masked for the runtime, similar
       to the effect of [systemctl(1)](https://www.chedong.com/phpMan.php/man/systemctl/1/markdown)'s mask command. This is useful to boot
       with certain units removed from the initial boot transaction for
       debugging system startup. May be specified more than once.
       rd.systemd.mask= is honored only by initial RAM disk (initrd) while
       systemd.mask= is honored only in the main system.

       If the systemd.wants= or rd.systemd.wants= option is specified and
       followed by a unit name, a start job for this unit is added to the
       initial transaction. This is useful to start one or more additional
       units at boot. May be specified more than once.  rd.systemd.wants= is
       honored only by initial RAM disk (initrd) while systemd.wants= is
       honored only in the main system.

       If the systemd.debug_shell or rd.systemd.debug_shell option is
       specified, the debug shell service "debug-shell.service" is pulled into
       the boot transaction and a debug shell will be spawned during early
       boot. By default, /dev/tty9 is used, but a specific tty can also be
       set, either with or without the /dev/ prefix. Note that the shell may
       also be turned on persistently by enabling it with [systemctl(1)](https://www.chedong.com/phpMan.php/man/systemctl/1/markdown)'s
       enable command.  rd.systemd.debug_shell= is honored only by initial RAM
       disk (initrd) while systemd.debug_shell is honored only in the main
       system.

       systemd-debug-generator implements [systemd.generator(7)](https://www.chedong.com/phpMan.php/man/systemd.generator/7/markdown).

SEE ALSO
       [systemd(1)](https://www.chedong.com/phpMan.php/man/systemd/1/markdown), [systemctl(1)](https://www.chedong.com/phpMan.php/man/systemctl/1/markdown), [kernel-command-line(7)](https://www.chedong.com/phpMan.php/man/kernel-command-line/7/markdown)

systemd 249                                         [SYSTEMD-DEBUG-GENERATOR(8)](https://www.chedong.com/phpMan.php/man/SYSTEMD-DEBUG-GENERATOR/8/markdown)