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cat loads the whole file, fit well with reading small config file
less is suggested for reading log, large file, less is more
g - go to top
G - go to bottom
/keyword - search for keyword
b - go backward 1 page
f - go forward 1 page
q - quit
common usage of cat:
cat a b > c: concatenate content of a and b and redirect the output to file c
cat > foo.txt: read from stdin and redirect to foo.txt
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Kafka: distributed streaming platform RabbitMQ: message broker Different Architecture Model: push & pull Storage: rabbitmq delete after ack, kafka stored on disk, and durable ordering: rabbitmq harder
缩写 全称 中文 操作对象 常见命令 DDL Data Definition Language 数据定义语言 结构（表、索引等） CREATE, ALTER, DROP, TRUNCATE DML Data Manipulation Language 数据操作语言 数据（行记录） INSERT, UPDATE, DELETE DQL Data Query Language 数据查询语
Transmission control protocol vs User datagram protocol TCP: use three handshake to establish connection between sender and receiver, more reliable, has flow control, has ordering, and guarantee data
-w: match whole word -i: ignore case -v: match doesn't contain -n: show line number -o: only show part that exactly matches -A n: n lines after the occurrence -B n: n lines before the occurrence -C n: