linux shell 判断字符串包含

方法一：利用grep查找

strA="long string"
strB="string"
result=$(echo $strA | grep "${strB}")
if [[ "$result" != "" ]]
then
    echo "包含"
else
    echo "不包含"
fi

方法二：利用字符串运算符

strA="helloworld"
strB="low"
if [[ $strA =~ $strB ]]
then
    echo "包含"
else
    echo "不包含"
fi

方法三：利用通配符

A="helloworld"
B="low"
if [[ $A == *$B* ]]
then
    echo "包含"
else
    echo "不包含"
fi