使用一个或多个实例抓取和拆分特定行

Question

给出.txt文件（DNA序列比对报告），格式为：

5463784 reads; of these:
  5463784 (100.00%) were paired; of these:
    841569 (15.40%) aligned concordantly 0 times
    4469608 (81.80%) aligned concordantly exactly 1 time
    152607 (2.79%) aligned concordantly >1 times
    ----
    841569 pairs aligned 0 times concordantly or discordantly; of these:
      1683138 mates make up the pairs; of these:
        1407028 (83.60%) aligned 0 times
        226521 (13.46%) aligned exactly 1 time
        49589 (2.95%) aligned >1 times
87.12% overall alignment rate

获取特定行的子部分的最简单和最简单的方法是什么？例如，如果我想要准确地抓住＆＃39;我可以使用的行：

awk '/exactly/{print}'

哪会回来：

4469608 (81.80%) aligned concordantly exactly 1 time
226521 (13.46%) aligned exactly 1 time

但是我不确定如何分解返回的内容以获取数组中的4469608和226521（最后总结为一起）以将变量设置为4696129。

Answer 1

awk '/exactly/ {sum=sum+$1;}END{print sum}' dna

对那些确切存在的行执行操作，将第一列的值存储在名为sum的awk变量中，并存储在最终打印中。