shell 字符串 开始 结束 子字符串

strIsSubstring()
{
case "$2" in
            $1*)
              echo $2 is start by current str $1;;
            *$1)
               echo $2 is end by current str $1;;
            *$1*)
               echo $1 is substring of $2;;

esac
}
strIsSubstring "b" "abc";
strIsSubstring "c" "abc";
strIsSubstring "a" "abc";

 运行结果：

b is substring of abc
abc is end by current str c
abc is start by current str a