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 ...
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...
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.
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...
```bash pip install Jinja2 1. 2. 2. **导入模板** 接下来,你需要导入Jinja的模板类。在你的Python脚本中添加以下代码: ```python ```python from jinja2 import Template 1. 2. 3. 4. 5. 6. 7. 8. 3. **渲染模板** 定义一个包含条件判断的模板,并渲染它。例如,我们定义一个模板,判断一个变...
Instead of checking if the string consists solely of spaces, verify if the string contains any character that is not a space. This is an alternative method to quickly determine if a string has anything other than spaces. How to test if string exists in file with Bash?
Sometimes, it is required to check if a string variable is empty or if it contains a string of zero length. There are many options in Bash to do this task. Using the “-z” option with the “if” statement is one of the ways to check whether a variable is empty or not. The uses...
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[[ $string == "specific_string" ]]或[ "$string" == "specific_string" ]。 字符串比较时未考虑大小写:Bash默认情况下是区分大小写的,因此如果特定字符串的...
[ -n STRING ] or [ STRING ] “STRING” 的长度为⾮零 non-zero则为真。[ STRING1 == STRING2 ] 如果2个字符串相同。 “=” may be used instead of “==” for strict POSIX compliance则为真。[ STRING1 != STRING2 ] 如果字符串不相等则为真。[ STRING1 < STRING2 ] 如果 “...
[ STRING1 != STRING2 ] 如果字符串不相等则为真。 [ STRING1 < STRING2 ] 如果 “STRING1” sorts before “STRING2” lexicographically in the current locale则为真。 [ STRING1 > STRING2 ] 如果 “STRING1” sorts after “STRING2” lexicographically in the current locale则为真。