shell腳本實例

grep & awk

1. 打印匹配行的第二列

   0.304443153 281764586 cycles

   0.304443153 76724668 instructions

   0.304443153 12055101 branch-instructions

   grep cycles test.txt | awk '{print $2}' 

   281764586

2. grep 完全匹配
   grep -w “word”
    
   1. awk計算平均值，最大值，最小值

      apuser@BJ08491PCU01:~/task/bug1145345/perf$ cat test.txt | head -10
      # started on Tue Aug 27 09:18:25 2019

      #           time             counts unit events
           0.304443153          281764586      cycles                   
           0.304443153           76724668      instructions             
           0.304443153           12055101      branch-instructions      
           0.304443153            2004530      branch-misses            
           0.304443153           22436839      cache-references         
           0.304443153            1346060      cache-misses             
           0.609641384          291220773      cycles  

      求平均值

      grep -w "branch-instructions" test.txt | awk '{print $2}'| awk '{sum+=$1}END{print "Average = ", sum/NR}'
      

      求最大值

      awk 'BEGIN {max = 0} {if ($1>max) max=$1 fi} END {print "Max=", max}'​​​​​​​

      求最小值

      awk 'BEGIN {min = 6553565} {if ($1<min) min=$1 fi} END {print "Min=", min}'
      

      求和

      awk '{sum+=$1} END {print "Sum = ", sum}' 

       

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