Found a total of 10000 related content
Linux Kernel Source Code Surpasses 40 Million Lines
Article Introduction：Linux: The cornerstone of modern computing, from smartphones to supercomputers, can do everything. Over the years, the size and complexity of the Linux kernel has increased significantly. As of January 2025, the Linux kernel source code contains approximately 40 million lines of code! This is one of the greatest achievements in the history of open source, community-driven projects.
This article will discuss the exponential growth of the number of lines in the Linux kernel source code, the reasons and how to check the current number of lines by yourself.
Directory
-Linux kernel history
Count the number of lines of the Linux kernel source code
only count C and header files
Exponential trend of kernel growth
Verify historical Linux kernel lines
Summary
Linux kernel history
Since 1991 Linus Tor
2025-03-05
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1053
How to Count Files Within a Directory in PHP?
Article Introduction：Counting Files in a Directory in PHPOne common task in programming is determining the number of files in a specific directory. PHP offers several...
2024-11-04
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1194
Mastering the Split Command in Linux: Effective File Splitting Techniques
Article Introduction：Powerful file segmentation tool in Linux system: detailed explanation of split command
In the Linux world, the split command is a powerful tool for splitting large files into smaller fragments. The split command is especially useful when dealing with large log files and compressed files because it can effectively solve the problem of excessive and difficult to deal with a single file. This article will dig into various options and usage examples of split commands and integrate multiple sources of information to help you get a full grasp of the command.
Splitting files based on line count
The split command can split files into smaller files based on the number of lines. By default, each split file contains 1000 lines. You can use the -l option to customize the number of lines per file.
2025-03-17
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1142
php get number of weeks in a month
Article Introduction：The number of weeks in a certain month can be obtained through PHP calculation. First, determine the day of the week of the month, and then calculate the number of weeks based on the total number of days. The formula is: ceil((total number of days of week-1)/7); if a week starts from Sunday, the calculation logic needs to be adjusted. 1. Use date() to get the number of weeks corresponding to the first day of each month; 2. Use cal_days_in_month() to get the total number of days in the month; 3. Use formulas to calculate the number of weeks. For example, January and October 2023 have 6 weeks, because the first day is Sunday and has 31 days. In actual application, we should clarify the starting date of the week, consider whether the framework provides date categories, and deal with situations across monthly and weekly.
2025-07-06
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592
How to Count Rows in a MySQL Table Using PHP
Article Introduction：The article provides a detailed guide on counting rows in a MySQL table using PHP. It explains the use of the SQL COUNT(*) function and demonstrates how to integrate this function into PHP code to retrieve the total number of rows in a table, providi
2024-10-21
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682
What is the difference between df and du commands?
Article Introduction：df displays the overall usage of the disk, providing an overview of used and available space; du counts the space usage of specific directories and files. 1.df is used to view the total space, used, remaining and usage percentage of each mounted file system, which is suitable for understanding the overall storage status of the system. 2.du goes deep into the directory structure, helps locate specific files or subdirectories that occupy space, and often simplifies output with options such as -sh. 3. The results of the two may differ due to different processing methods of deleted but not released files, hidden metadata or mount points. Tools such as lsof need to be used to troubleshoot abnormal space occupation.
2025-07-05
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846
Where to view Tomcat logs in Debian
Article Introduction：In Debian systems, Tomcat's log files are usually located in one of the following directories: /var/log/tomcatX or /opt/tomcatX/logs, where X is the version number of Tomcat. In the CATALINA_BASE/logs directory, where CATALINA_BASE is the installation base directory of Tomcat. Common log files include: catalina.out: record Tomcat's main log information, including startup information, normal runtime information, warnings and errors. localhost.YYYY-
2025-05-23
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491
How to use Composer to easily count PHP code lines
Article Introduction：When developing a PHP project, counting the number of lines of code is a common requirement, especially when evaluating project size or performing code reviews. However, manual statistics are not only time-consuming and error-prone. Recently, I encountered this requirement in my project. After trying multiple methods, I finally installed the sebastian/lines-of-code library through Composer, which easily solved this problem.
2025-04-17
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584
How to calculate the total number of elements in a PHP multidimensional array?
Article Introduction：Calculating the total number of elements in a PHP multidimensional array can be done using recursive or iterative methods. 1. The recursive method counts by traversing the array and recursively processing nested arrays. 2. The iterative method uses the stack to simulate recursion to avoid depth problems. 3. The array_walk_recursive function can also be implemented, but it requires manual counting.
2025-05-15
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333
jQuery count the number of checked checkboxes
Article Introduction：Use jQuery to count the number of check boxes in the table
Here is a simple jQuery code snippet that counts the number of check boxes that have been selected in the table:
$('#table :input[type="checkbox"]:checked').length
jQuery statistics checkbox number FAQ
How to count the number of check boxes selected using pure JavaScript?
While jQuery provides an easy and efficient way to count the number of check boxes selected, you can also use pure JavaScript to implement this functionality. You can use querySelectorAll method
2025-02-27
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787
How to get the length of a list in python?
Article Introduction：The most common way to get list lengths in Python is to use the built-in len() function. 1. Use the len() function to directly return the number of elements in the list, which is suitable for all iterable objects, such as strings, tuples, dictionaries and lists; 2. It is not recommended to loop through the list for manual counting, because it is inefficient and the code is verbose; 3. For nested lists, if you want to get the number of sublists of the outer list, you can still use len(). If you need the total number of elements, you can calculate the total number of elements in each sublist by sum() combined with len().
2025-06-28
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590
How to set and count bits using SETBIT and BITCOUNT?
Article Introduction：SETBIT sets the bit value of the specified position, and BITCOUNT counts the number of digits of 1. SETBIT is used to set 0 or 1 according to the offset in the Redis string. For example, SETBITmykey31 sets the third bit to 1; BITCOUNT uses BITCOUNT mykey to count all digits with a value of 1, and supports specified byte range statistics. Both are suitable for efficient storage of Boolean values, such as user active tracking, functional switch management and real-time analysis. For example, use the user ID date as the key and the mid-year and day as the offset to record the login status and count the total number of login days.
2025-07-04
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432
7 PHP Functions I Regret I Didn't Know Before
Article Introduction：If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
2024-11-13
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1499
How to clean up junk files in Debian system
Article Introduction：This article will guide you how to effectively clean up junk files in the Debian system, free up disk space, and improve system performance. Be sure to back up important data before performing any deletion operations. 1. Clean the APT cache APT cache stores downloaded packages. Cleaning these caches can free up a lot of space: sudoaptclean#Clean the download cache sudoaptcleanall#Clean the download cache and source code cache sudorm-rf/var/lib/apt/lists/*#Clean the package list cache 2. Cleaning the temporary file system will generate a large number of temporary files during the operation, and you can safely delete most of the files in the /tmp directory.
2025-04-12
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409
