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parentnode usage
How to use parentnode: 1. Create a sample HTML file; 2. Obtain the node object with the id "child" through the getElementById method; 3. Obtain the parent node object of the node using the parentNode attribute; 4. Output the parent node's The id is "parent".
What are the uses of grep in linux?The usage of grep in Linux includes basic usage, ignoring case, regular expression search, reverse search, counting the number of matching lines, recursive search, output line number and searching from the input stream, etc. Detailed introduction: 1. Basic usage. The basic usage of the grep command is to find lines containing the specified pattern in the file. To find the lines containing "example" in the file file.txt, you can execute the command "grep "example" file.txt "; 2. Ignore case. By default, grep is case-sensitive and so on.
What is the usage of grep in linux?The usage of grep in Linux is to search for lines of text that match a specific pattern and output the matching lines. The grep command has a variety of options and usages, allowing flexible search and matching operations according to different needs. Commonly used options are: 1. -i, ignore the case of characters when searching; 2. -n, display matching line numbers; 3. -c, count the number of matching lines; 4. -r, recursively search in the specified directory Search files under; 5. -l, only display file names containing matching items; 6. -v, reverse matching, output lines that do not contain matching items, etc.
What is the usage of typedefThe use of typedef is to create new aliases for existing data types. Using typedefs can increase the readability and maintainability of your code, especially when dealing with complex data types. For simple data types, such as integers, floating point numbers, or characters, the benefits of using aliases are not obvious. However, for complex data types such as pointers, structures, arrays, and functions, the advantages of using aliases are obvious. A typedef cannot be used before a variable or function definition and is usually created at the top of a program file or after a structure definition.
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