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The meaning of shell variable $#,$@,$0,$1,$2 in Linux is explained: Variable Description: $$ The shell itself PID (ProcessID) $! The PID of the Shell's last running background process $? End code of the last command to run (return value) $- Flag list using the SET command $* A list of all parameters. Output all parameters in the form of "$ $n", as in the case of "$*" with "". $@ A list of all parameters. su

Linux Shell series (3) Shell variable, linuxshell This article is part 3 of the Linux Shell series. For more shell tutorials, see the Linux Shell series tutorials.As an advanced script language, Shell also supports custom variable

Shell program design, shell program design experiment 1. Basic concepts of shell scripts: (1) Shell executes shell programs, which are usually called scripts. (2) Shell is a program that interfaces between users and systems. It al

Linux shell Escape Character metacharacter wildcard special character summary, shell escape1. linux shell wildcard (wildcard) Wildcards are processed by shell (not by the command statements involved, but we have not found any introduction to these wildcards in shell commands

1.shell Script InterpreterBourme Shell (/usr/bin/sh or/bin//bin//usr/bin//usr/bin/ for Root (/sbin /SH)Bash is widely used in the development environment because it is easy to use and free2. First shell script#!/bin/"Hello World"#! is a contract tag that tells the system what interpreter the script needs to execute.3. There are 2 ways to run the script,(1) One is

在study(Shell)专栏中，会深刻学习到shell编程And as an OPS person, the most basic ability is to learn shell script programmingTo improve efficiency in our work!Shell Programming:Compiler: Also called interpreterThe shell provides us with another function: To facilitate our work!Programming

[From] http://blog.chinaunix.net/uid-168249-id-2860686.html Reference: 1. system environment variables after a user logs on to the system:$ Home user's own directory$ Path: the directory to be searched during Command Execution$ TZ Time Zone$ Mailcheck the number of seconds to check whether a new letter exists$ PS1 prompt number in the Command Column$ PS2 indicates the prompt number when shell requests to re-input when the command has not been complete

Learning bash notes-debugging shell programs and learning bash shell In shell, the simplest debugging assistant outputs the echo statement. Many echo statements can be put into the code for debugging, but it takes enough time to locate The information to view. You may need to output a lot to find the information you want to search.1. the most basic set-o Command

Getting started with Shell programming (version 2) (medium) and getting started with shell programmingVariable test statement-test Purpose: test whether the variables are equal, empty, and file type. Format: Test condition or [] # range: integer, String, file 1) integer test: Test int1-eq int2 test whether the integer is equal Test int1-ge int2 test whether int1> = int2 Test int1-gt int2 test whether int1>

1. Write a shell script and a shell script I. shell and shell scripts In linux, the text starting with #/bin/bash is interpreted by the shell interpreter. Shell is an application that provides an interface through which users c

This article is part of the Linux Shell Series tutorial (17), more Linux shell tutorials: Linux Shell Tutorials Through file inclusion, you can reference the contents of other files, or you can separate complex content to make the program structure clearer. So the high-level language supports file inclusion or package references, and the

administrative files are text files that can be edited directly, most of which are in the standard directory:/etc. We write shell scripts most of the time are processing text information, and the pipeline can be used in order to be connected to the use of ... ... | ... In this way, the book has an example of a passwd file with 5 tubes attached to it. Then a script was written to convert the text into an HTML file. And then another script to help you

Login Shell: A full login process is required to go to bash. That is, by entering the account and password to log into the system, the obtained shell is called the login shellnon-login Shell: The method of obtaining the Sbash interface does not require a repeat login action. If you log in to Linux with X window, and then start the terminal with the graphical inte