Programmer Think

signal Introduction to signal and interrupt flow Signal refers to software interrupt signal, referred to as soft interrupt for short Interrupt source (interrupt signal generation position): Terminal device driver The interrupt signals ctrl+c, ctrl+z, ctrl generated by pressing the key on the terminal equipment+\Hardware excepti ...

○ reference links 🔗 Product manual (zabbix.com) Zabbix Chinese document Windows agent installation from MSI 1, Introduction to Zabbix 🔊 🏆 Zabbix is an enterprise class open source solution that provides distributed system monitoring and network monitoring functions based on WEB interface. 🌈 It can monitor various network ...

1, awk introduction 1. awk overview awk is a programming language, which is mainly used to process text and data under linux/unix. It is a tool under linux/unix. The data can come from standard input, one or more files, or the output of other commands. awk's way of processing text and data: scan the file line by line. By default, from the f ...

1, Foreword Cross platform really spent a lot of energy to start from Qt4 7 compatible to Qt6 2 and subsequent versions have lost a lot of hair, and only a few hairs are left. Hey, maybe this is the life of programmers. I have written Qt programs for so many years and prefer to support multiple Qt versions, especially for supporting any Qt ver ...

1, Curriculum system Concept Sequence table, single chain table, one-way circular table, two-way circular table, queue, stack Tree Figure Algorithm: Search algorithm 2, Why learn data structures 1. Program = data structure + algorithm Data structure is not only a very important thing to write code, but also a basic course 2. Data stru ...

The function of the sort command is to sort by line Usage: sort [OPTION]... [FILE]... sort [OPTION]... --files0-from=F Options: Sort class options: -b. -- ignore leading blanks -- ignore spaces at the beginning of a line -d. -- dictionary order only handles spaces, English letters and numbers -f. -- ignore case -- lowercase lette ...

1, Thread 1. Thread overview (differences from processes and advantages of threads) Multithreading development has been supported by mature pthread library on Linux platform. The most basic concepts of multithreading development include three points: thread, mutex and condition. Among them, thread operation is divided into thread creation ...

fstat,stat,lstat Get file status information (status). prototype #include<unistd.h> #include<sys/stat.h> #include<sys/types.h> int fstat(int fildes, struct stat *buf); int stat(const char *path, struct stat *buf); int lstat(const char *path, struct stat *buf)； Write the file status information into the stat stru ...

1. Environmental planning Environment system version, hereinafter referred to as host A and host BA: CentOS 7.6 (172.20.10.4)B: RedHat 8.2 (172.20.10.6) Machine A establishes and uploads test files for easy distinction. The naming method is "system abbreviation + system version + virtual account abbreviation" [root@CentOS7-6 test]# ...

Utility program File and folder operations Create / delete empty directory - mkdir / rmdir. [root ~]# mkdir abc [root ~]# mkdir -p xyz/abc [root ~]# rmdir abc Create / delete file - touch / rm. [root ~]# touch readme.txt [root ~]# touch error.txt [root ~]# rm error.txt rm: remove regular empty file 'error.txt'? y [root ~]# rm -rf xyz T ...