AWK解释awk -F'AUTO_INCREMENT =''NF == 1 {print“0”; next} {sub（/。* /，“”，$ 2）; print $ 2}'

Question

我在工作中经历了一些简单的bash脚本，这是其他人在一个月前写的，我发现了这一行：

| awk -F'AUTO_INCREMENT=' 'NF==1{print "0";next}{sub(/ .*/,"",$2);print $2}'

有人可以帮助我用简单的词语解释这一行。谢谢！

Answer 1

awk -F'AUTO_INCREMENT=' '     # Set 'AUTO_INCREMENT=' as a field separator
    NF==1 {                   # If number of fields is one i.e. a blank line
      print "0";              # print '0'
      next                    # Go to next record i.e. skip following code  
    }
    {
      sub(/ .*/,"",$2);       # Delete anything after a space in the second field 
      print $2                # Print the second field 
     }'

示例

示例输入

AUTO_INCREMENT=3

AUTO_INCREMENT=10 20 30 foo bar

输出

3
0
10