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2019_07_06_the_awk_programming_language.md

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The AWK Programming Language

  • TODO
  • https://github.com/wuzhouhui/awk

关联数组

假设 logfile 就是一堆 ip
1.2.3.4
2.3.1.3
...

awk '{count[$1]++;} END{for (var in count) {print var" = "count[var]}' logfile
统计 ip 出现的次数。

if ("key" in map)         <--  要这样来判断 key 是否存在，不能写 if (map["key"] == "value") ...