Unix awk子串字符串比较

Question

我想使用Unix AWK命令查找字符串中是否包含子字符串。

例如，伪代码：

a= commandline
b=line
if(b is contained in a)
  print "success " 

Answer 1

$ awk 'BEGIN{a="commandline";b="line";if (a ~ b){print "success"}}'
success