Programmer Think

#Introduction This article mainly introduces the basic knowledge of users and user groups in Linux; It includes how to use commands to create and delete users, create and delete user groups, and how to effectively manage users and user groups. #Article catalogue 0 × 1.Linux user information file and password file0 × 2.Linux user gr ...

Linux recycle bin – create a simple recycle bin with a shell script Requirements to be met Write a script – myrm SH, delete files. It has the function of recycle bin. All deleted files are stored in / my_backup directory;Write a script that can recover deleted files_ back. SH, which can restore the deleted file to the original pat ...

Programming environment: Ubuntu Kylin 16.04 Code warehouse: https://gitee.com/AprilSloan/linux0.11-project linux0.11 source code download (it cannot be compiled directly and needs to be modified) 1. Add kernel After entering the kernel, it does not immediately enter the main function. In the previous chapter, gdt is only set temporarily. In ...

Standard IO relies on system IO for implementation. The concept of a file descriptor File IO operations: open, close, read, write, lseek Difference between File IO and Standard IO Efficiency issues with IO File sharing Atomic Operation Redirection implementation in program: dup, dup2 Sync: sync, fsync, fdatasync fcntl(); ioctl(); /dev/fd/direct ...

Previously, we have declared the targets instance to monitor and collect our node service status, as follows However, when prometheus loads the target instance, there will be some default tags. We put the mouse over the label and it will be displayed These tags will help us to declare how prometheus should get indicators from the targ ...

order I translated this article. The following is the translated article. The source of the article is: https://blog.packagecloud.io/yum-repository-internals/ abstract By testing the metadata in the yum warehouse (metadata < some index files >), this article deeply understands the internal structure of the yum warehouse. I will introdu ...

1, Preface The parking lot management system written by sqlite3 Its main functions are 1. Check the garage vacancy 2 Car owners choose parking spaces 3. System billing 4 View parking records of specified vehicles 5. Check the parking records of all vehicles 6 sign out 2, Explain time_t() function (because it is used) Let's explai ...

Linux system transplantation: Kernel top-level Makefile (Part 2) Continue to analyze the top-level Makefile execution process of Linux kernel source code 1, make defconfig procedure Like the top-level makefile of uboot, make XXX should be used before compiling the source code_ Defconfig configures the Linux kernel, and the code configure ...

The test environment built this time: PHP (5.5-7.0) + Apache (> 2.0) + MySQL 5 7 (Architecture) → Windows/Linux The first step is to install the basic software through yum Installation method: directly use after decompression; rpm file installation; yum online installation; There is no need to configure the yum source here, becaus ...

Primary directory Secondary directory Tertiary directory 1. Pipeline 1. Anonymous pipeline Anonymous pipes communicate with blood related processes Anonymous pipeline communication steps: 1. A process opens the same file in read-write mode respectively, so there are two file descriptors, one pointing to the file in read mode and th ...