Programmer Group

catalogue 1, Common pipeline commands 1.1 sort command 1.2 uniq command 1.3 tr command 1.4cut command 1.5 examples 1.5.1 statistics of current host connection status 1.5.2 count the number of currently connected hosts 2, Regular expression 2.1 definition of regular expression 2.2 common metacharacters (supported tools: find, grep, eg ...

Today, I will continue to introduce you to the basic knowledge of Linux. The main content of this article is the branch of Linux shell script. 1, shell branch -- if statement form In shell script, we usually use if statement to make the script execute different commands according to some conditions, which can greatly make the function of the ...

RPM (Redhat Package Manager) is a common package manager for Linux distribution s such as Redhat, CentOS and Fedora. RPM tool can be used to make source installation package and binary installation package. This document provides an example to illustrate how to make an RPM binary package. 1. Preparation Install the programs required for packa ...

2021SC@SDUSC How to build Shell-CLI conforming to POSIX utility conventions What is Argtable Argtable is an open source ANSI C library that parses GNU-style command line options. It simplifies command line analysis by defining declarative API s that can be used to specify command line syntax. argtable automatically generates consistent t ...

1. ps process to view the instantaneous process status (use the top command to view the real-time process) ps supports three formats of commands 1) Unix style, options start with -. 2) BSD style, options cannot start with -. 3) GNU long option, which starts with -. Commands of the three formats can be mixed, but there may be conflicts. Use eac ...

From: FreeBuf.COM Author: secist Links:https://www.freebuf.com/sectool/212820.html Sampler is a tool for shell command execution, visualization, and alerts. It is configured using a simple YAML file. 1. Why do I need it? You can sample any dynamic process directly from the terminal - watch for changes in the database, monito ...

introduction Today, let's introduce the interactive free tools in the shell, which are used to realize automatic interactive tasks without human intervention. It can bring you convenience and make it easier for you to complete your work. 1, Here Document interaction free 1. General Use I/O redirection to provide a list of commands t ...

preface Today, I'd like to introduce two interactive software Here Document and Expect. The former system comes with its own tools, and the latter needs to be installed. After mastering these two tools, it will help our production work. Let's go into them and have a look. 1, Here Document interaction free 1. Overview: Use I/O redirectio ...

preface sed (Stream EDitor) is a powerful and simple text parsing and conversion tool. It can read the text, edit the text content (delete, replace, add, move, etc.) according to the specified conditions, and finally output all lines or only some lines processed. sed can also realize quite complex text processing operations without inter ...

crontab command -u: Specify a user, the current user without the -u option -e: Develop planned tasks -l: List scheduled tasks -r: Delete scheduled tasks View the configuration file for crontab: [root@localhost ~]# cat /etc/crontab SHELL=/bin/bash PATH=/sbin:/bin:/usr/sbin:/usr/bin MAILTO=root # For details ...