bash if 语句中带有变量的通配符

Question

我想根据this solution.

在字符串中查找子串

但由于某些原因它不适用于变量：

str="abcd";
substr="abc";
if [[ "${substr}"* == ${str} ]]
then
        echo "CONTAINS!";
fi

Answer 1

在参考手册section Conditional Constructs中，您将阅读[[ ... ]]的文档：

When the == and != operators are used, the string to the right of the operator is considered a pattern and matched according to the rules described below in Pattern Matching, as if the extglob shell option were enabled.

（强调是我的）

因此您需要将 glob 模式 放在 == 运算符的右侧 :

if [[ $str == "$substr"* ]]; then

注意左边不用引号，右边的$substr部分需要引号，以防包含glob 字符，如 *、?、[...]、+(...) 等

bash if 语句中带有变量的通配符

bash wildcard with variables inside an if statement

string

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if-statement

wildcard