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ulimit [-SHacdflmnpstuv [limit]]
Provides control over the resources available to the shell and to processes started by it, on systems that allow such control. The -H
and -S options specify that the hard or soft limit is set for the given resource. A hard limit cannot be increased once it is set; a
soft limit may be increased up to the value of the hard limit. If neither -H nor -S is specified, both the soft and hard limits are set.
# jumps straight to the definition of ulimit in the bash man page.