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String interception of Linux is useful. There are eight ways.Suppose there is a variable var=http://www.hao.com/123.htm..A # Intercept, delete the left character, and leave the right character.Echo ${var#*//}where Var is the variable name and the #

9 Kinds of interception of strings in shell, take var=http://www.google.com/test/.html as an example(1) Method one: # Intercept, delete the left character, retain the right character.Echo ${var#*//}var is the variable name, and the # is the operator,

Linux There are eight ways to intercept a string. Suppose there is a variable var=http://www.aaa.com/123.htm.1. # Intercept, delete the left character, leave the right character. The code is as follows:Echo ${var#*//}where var is the variable name

Answer reference:Suppose there are variablesvar=http://www.oldboyedu.com/123.htm.1. # Intercept, delete the left character, leave the right character.Variable: Var=http://www.oldboyedu.com/123.htmecho ${var#*//} where Var is the variable name and

Tag: The shell operator represents the deletion of the first character net article BSP comSuppose there is a variable var=http://www.aaa.com/123.htm.1. # Intercept, delete the left character, leave the right character.Echo ${var#*//}where Var is the

One: Linux shell string interception and splicingSuppose there is a variable var=http://www.linuxidc.com/123.htm 1 # Intercept, delete the left character, and leave the right character.  Echo ${var#*//}where Var is the variable name and the # is an

Transferred from: http://www.jb51.net/article/56563.htmString interception of Linux is useful. There are eight ways.Suppose there is a variable var=http://www.aaa.com/123.htm.1. # Intercept, delete the left character, leave the right character.Echo $

String interception from the original address: http://www.jb51.net/article/56563.htmOne: string interceptionThere are VAR variables:var=http://www.aaa.com/123.htm1. # Intercept, delete the left character, leave the right character.echo ${var#*//}Www.

String interception of Linux is useful. There are eight ways.Suppose there is a variable var=http://www.aaa.com/123.htm.1. # Intercept, delete the left character, leave the right character.The code looks like this: Echo ${var#*//}where Var is the

First, the condition judgment if () { } elsif () { } ... else{ } Second, Cycle: 1, while loop while () { } 2, until cycle Until () { } 3, Class C for the loop, such as for ($count =1; $count # statements inside the loop go } Here is an example

Variable Description:$$ The shell itself PID (ProcessID)$! PID of the Shell's last running background process$? End code of last Run command (return value)$-flag at a glance using the SET command$* all parameter lists. such as "$*" in the Case of ""

Excerpt from: http://blog.csdn.net/zhoudengqing3. Internal problemsQuestion 1:Given the bool,int,float, the IF statement of the pointer variable compared to the "0 value" (assuming that the variable is named Var)Answer:BOOL Variant: if (!var) int

Write down questions that you don't understand in your exams: 1, c reentrant function Reentrant functions are primarily used in multitasking environments, where a reentrant function is simply a function that can be interrupted , that is, it can be

Use DOM script to set style information: (by Wushan) On most occasions, we use CSS to set styles, but in some special cases, for example, to set the node style information based on the position of the element in the node tree, CSS is not yet able to

First, Shell introductionThe shell is a program written in C that is a bridge for users to use Linux.The shell is both a command language and a programming language.A Shell is an application that provides an interface through which users access the

This article mainly introduces Python and shell variable transfer methods, using environment variables, pipelines and other methodsPython--Shell:1. Environment variablesCopy CodeThe code is as follows:Import OSvar=123 or var= ' 123 'Os.environ[' var

There are a number of ways to intercept strings in the shell, ${expression} There are 9 ways to use them. ${parameter:-word}${parameter:=word}${parameter:?word}${parameter:+word} The above 4 alternatives can be used for default values. ${#parameter}

1. Introduction to Stored Procedures Our common Operations database language SQL statements need to be compiled and executed at execution time, and the stored procedure (Stored Procedure) is a set of SQL statements that are compiled and stored in

calculate the front of a specific directory Ten a large fileIn a given directory, want to know which large files exist, take the top 10, by file size ranking(1) , using awk to achieve#!/bin/bashPath=/root/shellFind $path-type F | awk ' {Var=$0"Ls-l"

PHP's Isset () function is commonly used to detect whether a variable is setFormat: bool Isset (mixed var [, mixed Var [, ...])Function: Detect whether the variable is setreturn value:Returns FALSE if the variable does not existReturns FALSE if the