Delete ALL your compute engine instances from the default project

gcutil_delete.md

delete EVERY instance

gcutil --format=names listinstances | while read inst; do gcutil deleteinstance $inst -f --delete_boot_pd&; done;

Only Unused ones

gcutil listinstances --filter="status ne RUNNING" --format=names | while read inst; do gcutil deleteinstance $inst -f --delete_boot_pd&; done;