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In October 2013 National Geographic released a file titled American Blackout which dealt with an imagined large-scale cyber attack on SCADA and the US electrical grid.
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lpsched(1m) [opensolaris man page]

lpsched(1M)						  System Administration Commands					       lpsched(1M)

NAME
lpsched - start the LP print service SYNOPSIS
lpsched [-f num_filters] [-n num_notifiers] [-p fd_limit] [-r reserved_fds] DESCRIPTION
The lpsched command starts or restarts the LP print service. The lpshut command stops the LP print service. Printers that are restarted using lpsched reprint (in their entirety) print requests that were stopped by lpshut. See lpshut(1M). It is recommended that you start and stop the LP print service using svcadm(1M). See NOTES. OPTIONS
The following options are supported: -f num_filters Specifies the number of concurrent slow filters that may be run on a print server. A default value of 1 is used if none is specified. Depending on server configuration, a value of 1 may cause printers to remain idle while there are jobs queued to them. -n num_notifiers Specifies the number of concurrent notification processes that can run on a print server. A default value of 1 is used when none is specified. -p fd_limit Specifies the file descriptor resource limit for the lpsched process. A default value of 4096 is used if none is specified. On extremely large and active print servers, it may be necessary to increase this value. -r reserved_fds Specifies the number of file descriptors that the scheduler reserves for internal communications under heavy load. A default value of 2 is used when none is specified. It should not be necessary to modify this value unless instructed to do so when troubleshooting problems under high load. EXIT STATUS
The following exit values are returned: 0 Successful completion. non-zero An error occurred. FILES
/var/spool/lp/* LP print queue. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWpsu | +-----------------------------+-----------------------------+ SEE ALSO
lp(1), svcs(1), lpstat(1), lpadmin(1M), lpmove(1M), lpshut(1M), svcadm(1M), attributes(5), smf(5) NOTES
The lpsched service is managed by the service management facility, smf(5), under the service identifier: svc:/application/print/server Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). The ser- vice's status can be queried using the svcs(1) command. SunOS 5.11 3 Sep 2004 lpsched(1M)

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