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See also

top - measure memory/processor usage on machine

...

qdel - delete jobs from torque scheduler - list job numbers followed by space between them ( example - qdel 100134 100145 ... )

qdel all - delete all jobs. This can be used during maintenance.

lshw - see the hardware details of machine

halt -p now  - poweroff the machine immediately. Or shutdown -h now will so the same thing.

touch /etc/nologin or vi /etc/nologin with text - won't allow users except root log in. This file will be removed automatically after system reboot.

rm /etc/nologin - allow users log in