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bash if "-n" option
-n string is not null. -z string is null, that is, has zero length
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pip install git branch
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check network card name linux
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Class "SimpleXMLElement" not found
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linux find all files name containing string
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python compile dlib without cuda
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# /bin/bash for launching ec2
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docker images only name
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fuser install linux
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git pull from previous commit
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