bash shell scripting tutorial

Tags: ret strong expr pts null. sh com bin filedetermine whether a variable is an integer through expr[email protected] scripts]# cat judge.sh#!/bin/bash############################################################### File Name:judge.sh# version:v1.0# Author:rain Jin# Blog site:http://www.cnblogs.com/rainjin/# Created Time:2017-10-27 21:19:42# Environment:centos 7.2 kernal 3.10.0###############################################################judging If

1.1 String test operatorThe string test operator has the function of comparing whether two strings are the same, whether the length of a string is zero, whether the string is null (NOTE: Bash distinguishes between 0-length strings and empty strings, etc.)The following table is a common string operatorYou can also view the string test operator with the man testString test operator Hints:(1)-N compares whether the string length is nonzero, or true if no

First, Shell introduction The design of many Unix-like operating systems is stunning. Even today, the UNIX-style operating system architecture remains one of the best designs ever. One of the most important features of this architecture is the command line interface or shell. The shell environment allows users to interact with the core functions of the operating

This article is part (iii) of the Linux Shell Series tutorial, more on the Shell Tutorial: Linux Shell Series Tutorials The shell is an advanced scripting class language and also su

process it appears that the current host has only the kernel and the current processshell--Child Shell Pstree ViewBash Features:1. Command historyView command history: Historical-C: Empty command history-D OFFSET [n]: Delete the specified location history command-W: Save the Command history to the history filecommand history buffer Size: histsize echo $HISTSIZECommand history Usage Tips:!n: Execute nth command in command history!-n: Executes the last

return value of the function. $$ The current shell process ID. For Shell scripts, this is the process ID where the scripts are located. Command-line argumentsThe arguments passed to the script when the script is run are called command-line arguments. Command-line arguments are represented by a $n, for example, $ = for the first argument, and $ for the second argument, and so

The shell is a scripting language, so you have to have an interpreter to execute the scripts.The common shell scripting interpreters on Unix/linux include bash, sh, csh, Ksh, and so on, which are used to call them a shell. we ofte

This article mainly introduces the Linux Shell Script series (i): Introduction to the shell, this article explains the shell introduction, Shell basic operations, how to open the shell terminal, Shell script concept, how to run

is stored in the variable: syntax: Read var1, Var2, ..., VarnWrite the following script file, prompt the user to enter a name, the user uses the keyboard input name, stored in the specified variable, and then display:VI Sayh Echo " "read fname # user input is stored inside the fname!!! Echo " Hello $fname, Lets be friend! "Execute the following statement to run Sayh:chmod +x sayh$. /sayhYour First Name:ZhaoHello Zhao, Lets be friend!2.4 Wildcard charactersReference documents:[1] Linux

The shell supports custom variables.Defining variablesWhen defining a variable, the variable name does not have a dollar sign ($), such as: VariableName="value" Note that there can be no spaces between the variable name and the equals sign, which may be different from any programming language you are familiar with. At the same time, the name of the variable names must follow the following rules: The first character must be a le

using a C-type shell, the default prompt character%. There are also a variety of Bourne shell subcategories listed below: · Bourne Shell (SH) · Korn Shell (Ksh) · Bourne Again Shell (bash) · POSIX

Shell Getting Started Tutorial (1)-shell Basics-JUSTKK's Column-Blog channel-csdn.nethttp://blog.csdn.net/justkk/article/details/43795131 Shell Getting Started Tutorial (2)-Variables and Parameters-JUSTKK's Column-Blog channel-csdn.nethttp://blog.csdn.net/justkk/article/deta