man limits.conf
Quote:
hard
for enforcing hard resource limits. These limits are set by the superuser and
enforced by the Kernel. The user cannot raise his requirement of system
resources above such values.
soft
for enforcing soft resource limits. These limits are ones that the user can
move up or down within the permitted range by any pre-existing hard limits.
The values specified with this token can be thought of as default values, for
normal system usage.
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I can't understand your second question at all. I understand English may not be your first language, but please, make a bigger effort to use it well.