So, you have a long string and you want to check of this string contains a substring in your bash script. There are more than one way to check for substrings in bash shell. I'll show some simple examples first, followed by a cool bash script that uses this concept in a real-world ...
在Bash中,if条件语句用于根据条件的真假执行不同的代码块。 当使用if条件在比较特定字符串时不匹配时,可能是由于以下原因: 字符串比较时未使用正确的语法:在Bash中,字符串比较应使用双括号[[ ]]或双方括号[ ],并且在比较运算符周围使用空格。例如,正确的语法是[[ $string == "specific_string" ]]或...
One of the most common operations when working with strings in Bash is to determine whether or not a string contains another string. In this article, we will show you several ways to check if a string contains a substring.
怎么样?stackoverflow.com/questions/229551/string-contains-in-bash 我的var1是一个运行和输出数据的命令,就像我上面提到的那样。所以我将$var与$var1进行比较,但它从未成功地找到我从$var中放入的任何字符串。 @hhh0505看起来变量中仍然有一些奇怪的东西。尝试在if之前添加declare -p var groups并查看它打印的...
if [[ $string == *Hello* ]]; then echo "The string contains 'Hello'" fi ``` 在上面的示例中,首先定义了一个字符串变量string,然后使用if语句判断该字符串是否包含“Hello”这个子字符串。如果包含,则输出提示信息。需要注意的是,在if语句中双括号“[[”和“]]”用来扩起条件判断表达式,这是Bash sh...
4.2 Searching with case-insensitive string 5. Using awk 6. Using sed with grep Command 7. Conclusion 1. Overview In this article, we will see how to check if output contains String in Bash using grep, Conditional Expressions, awk, sed commands with various options. 2. Introduction to Proble...
str="hello world" if [[ "$str" == *world* ]]; then echo "String contains 'world'" else echo "String does not contain 'world'" fi 测试并验证if判断字符串的功能: 将上述脚本保存为一个文件(例如test.sh),然后给予执行权限并运行: bash chmod +x test.sh ./test.sh 这将帮助你验证每...
The uses of the “-z” and “-n” option to test the string values using the “if” statement in Bash are shown in this tutorial. Using the “If -Z” Statement Sometimes, it is required to check if a string variable is empty or if it contains a string of zero length. There are...
echo "String contains lowercase letters" else echo "String does not contain lowercase letters" fi ``` 这段代码将输出 "String contains lowercase letters",因为变量 str 中的字符串包含小写字母。 总的来说,Linux 中的 if 语句和字符串匹配是编写 Bash 脚本时基本的工具之一。通过合理的使用条件判断和字符...
The script needs a way to verify that the constant contains aninteger. Using [[ ]] with the =~ string expression operator, we could improve the script this way: 其返回值为真,如果 string1匹配扩展的正则表达式 regex。这就为执行比如数据验证等任务提供了许多可能性。在我们前面的整数表达式示例中,...