Shell

RecommendedArticle: APIS for file path operations in Shell Http://www.cnblogs.com/fangkm/archive/2009/04/15/1436674.html   I wanted to sort it out by myself, but I found the above article by Google according to the title of the phenomenon, and I

You can change the shell in three ways: 1. Change the default shell for all later logon sessions Enter the command CHSH-L to view the available shell and its path of the current system. After entering CHSH, the system prompts you to enter the

The source command can load another script in one script. The following is an example: First, we define a function script named myfunc. Sh, as follows: #! /Bin/bashFunction Square{Local tempLet temp = $1*$1The sum of squares of Echo "$1 is: $ Temp"

I learned the shell script today and copied a simple script on the Internet as follows: #! /Bin/bashCygwin = true# Assign values to variables:A = "Hello World" # No space exists on both sides of the equal sign# Print the value of variable:If $

Tangent to Vertex Returns a convex polygon.P, TangentLIsPIntersection andPInternalL. This concept is similar to orthogonal tangent. Pair of vertex points If two verticesPAndQ(BelongP) In the two parallel tangent lines, they form a pair of

The daily log analysis team is really sorry. We often need to provide statistics such as PV, UV, and independent IP addresses. C/C ++ and Java can all be used to write logs. The process is like this, first, read the file, scan it row by row, put the

Http://www.xxlinux.com/linux/article/development/shell/2006-09-22/4499.htmlHttp://www.diybl.com/course/6_system/linux/Linuxjs/20071027/80454.htmlHttp://linux.chinaunix.net/techdoc/system/2008/09/04/1030374.shtmlBoth exec and source are Bash Internal

Linux bash calculator is easy to use, at least it is easier to be lazy. How: 1. Use the command line# Scale indicates the exact number of digits of a floating point.[Root @ hostname ~] # BCBC 1.06Copyright 1991-1994,199 7, 1998,200 0 Free

This article is great for people who have been using bash in Linux for a long time. The for command has powerful functions! Self, http://hi.bccn.net/space-21499-do-blog-id-13524.html For allows some commands that do not support wildcards to operate

Do you still remember the regular expression that used to calculate prime numbers? The world of programming is so interesting that you will always be able to see something special. Have you ever thought that you can put your variables and functions

1. Get user input.The parameter is the regular expression that is correctly checked by the input prompt, and the default value is entered.ReturnThe correct user input is returned. Function get_input (){Prompt = $1RegEx = $2Default = $3If ["x $

Shell: Shell Baidu Encyclopedia: Baidu. It receives user commands and calls corresponding applications. It is also a programming language. As a command language, it interactively interprets and executes user-entered commands or automatically

6.3 start the shell Environment The init_post function comes from the 814 rows of the same file:   811/* This is a non _ init function. force it to be noinline otherwise gcc812 * makes it inline to Init () and it becomes part of init. Text

#! /Bin/bash A = "one, two, three, four" # To split $ A, you can: Old_ifs = "$ ifs" Ifs = "," Arr = ($) Ifs = "$ old_ifs" For s in $ {arr [@]} Do Echo "$ S" Done The above code will output One Two Three Four Arr = ($ A) is used to

Format: Test conditions Test-N string: string is not emptyTest-Z string: string is empty Test int1-EQ int2: int1 = int 2Test int1-ne int2: int1! = Int2Test int1-GT int2: int1> int2Test int1-ge int2: int1> = int2Test int1-lt int2: int1 Test int1-Le

This article is the fifth chapter of Flow Control in learning the bash shell 3rd edition, but we will not limit it to this. Flow Control is a common part of any programming language and includes bash. Here we will learn about them. If/else is used

Note: No space is allowed between the left and right sides of "=". The semicolon program 1 # is not required at the end of the bash statement #! /Bin/sh # echo somethingecho "Hello World" Echo "Hello !! "CD/root/export topmkdir./ABC Program 2,

There is no doubt about the strength of shell, which makes it easier for us to confuse us. For example, I have always thought that I am smart and cannot tell you clearly. In Shell, Parentheses, braces, and variables in parentheses are used as

$1 indicates the first parameter. $ * indicates all parameters entered by the user. The hello1 script is as follows. A location parameter is acceptable. #! /Bin/bash Echo $1   Run the Script:./hello1 "Hello World" and output Hello World on the

The Select expression is a bash extension application, especially for interactive use. You can select from a group of different values.Select VaR in...; doBreakDone... Now $ VaR can be used ....The following is an example:#! /Bin/shEcho "What is