ConcurrentHashMap is designed to support concurrent access from multiple threads without the need for external synchronization. It achieves this by using var...
Try to get a certificate from Let’s encrypt on Oracle’s compute instance (vm) with command certbot certonly --standalone but keeps getting error:
Certbot fai...
Note for Learning Awk Is Essential For Linux Users
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awk is a tool to process text, line by line.
Variable
$0 means whole line, $1 means the fi...
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