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    Welcome to the Raspberry Pi SE site. Please take a few moments to take "the tour" to familiarize yourself with how things work here. Also please read these guidelines on asking good questions. A quick search will often yield useful answers to questions, or guide you in asking a "better question". Commented Dec 25, 2018 at 19:03
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    this is not an RPI question ..... it is a Linux question .... please use google search linux .cache to get your answer Commented Dec 25, 2018 at 19:42