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Swap is an area on a hard drive that has been designated as a place where the operating system can temporarily store data that it can no longer hold in RAM.

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cnblogswww.cnblogs.com/barrychiao/archive/2012/10/22/2733210.html
gnuwww.gnu.org/savannah-checkouts/gnu/bash/manual/bash.html#Shell-Parameter-Expansion
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