Shell

1. Describe the operation principle of shell program (can be attached with necessary graphic instructions);Shell Summary2, summarize all the knowledge points involved in shell programming (such as: variables, grammar, command status, etc., to take

The bash built-in command does not need to search the path provided in the environment variable $path, so it can be executed directly, so it is fast.Here are a few simple, essential command usages.1. HelpPurpose: Displays a list of all bash built-in

Http://blog.sina.com.cn/s/blog_6db275da0101asmf.html((i= $j + $k)) equivalent to i= ' expr $j + $k '((i= $j-$k)) equivalent to i= ' expr $j-$k '((i= $j * $k)) equivalent to i= ' expr $j \* $k '((i= $j/$k)) equivalent to i= ' expr $j/$k 'Let

Suppose there are variables var=http://www.hao.com/123.htm  One, # Intercept, delete the left character, retain the right character.  Echo ${var#*//}where Var is the variable name, # is the operator, *//  deletes all characters from the

Course Outline:1. Shell FeaturesOrder history!! !$!n! characterTab key to complete file path or commandAlias a= "B" Unalias AWildcard * Matches 0 or more characters? Match one characterinput and output redirection;, >>, , 2>>Pipe symbol |Job Control

First, prefaceIn structured programming, there are three main structures: sequential, branching, and cyclic. This shows the importance of branch judgment.And in shell programming often encountered in the case of judgment, such as: Determine whether

Note: Gitlab is a git service program that has a Web graphical interface and a range of management tools, specifically detailed to Google it.This can be said to be the last "Linux shell script Atlassian Confluence Remote backup method" of the sister

1. Script instanceSave the following script as getftp.sh# !/bin/bash datesign= ' date-d -95day +%y%m%d ' ftp -NV 12.2.2.28 ! Ftprunuser User01 User01 Prompt bin CD TXT LCD /app/info/getftpmget ${datesign}*. Txtbye! FtprunScript

Shell Script pros and cons analysisThe shell uses external commands and some of the default tools of the bash shell, so it often calls an external library of functions, so the command cycle is less than the traditional programming language.Therefore,

PackagedTarCpioCompressionZipbz2Example:① Batch compression script: tar-gzip-dir-rm.shImplementation features: Compressed directory under all folders for the same name packaging compressed files (tar.gz), compression after successful deletion;Script

Linux Server Batch Deployment application shell script:1. Please replace the server address (Tomcat or jetty server) within the codeserverroot=/home/undoner/java_tool/apache-tomcat-7.0.61Serverdir=/home/undoner/java_tool/apache-tomcat-7.0.61/webapps2

 1, creating table: Create ' t1 ', ' F1 ', ' F2 ', ' F3 '                   #-------T1 is the table name, F1,F2 , F3 is the column family name  2, view all tables: list 3, view the structure of the table: describe ' t1 '  4, add a column family:

Practice One: Write a script1The value of the set variable file is/etc/passwd2. Turn to/etc/Say hello to each user in passwd and say what the ID is like: (Hint: line= ' Wc-l/etc/passwd | Cut-d" "-F1 ') Hello,root,your UID is 0. 3. Statistics a how

File Status Test-B FileName: Returns True when filename exists and is a block file (returns 0)-C FileName: Returns True when filename exists and is a character file-D Pathname: Returns True when pathname exists and is a directory-E Pathname: Returns

first, the expression of the blockBecause the shell can not define a two-dimensional array, so can only use one-dimensional array to represent the box, Tetris can be divided into 7 categories, each type of block is composed of four types of small

Read a file line For Command substitution Code block redirection While Pipe character Code block redirection ForIFS=$‘\n‘forin-l`do (( count++ ))doneecho$countNote:For read,

Tools for batch files (Java+shell for implementation)There is a lot of corpus that needs to be handled, and should be able to be directly handled directly with shell scripts.But the shell script is not familiar, just a few simple commands. Therefore,

The Linux shell is much more powerful in programming than Windows batch processing, both in loops and operations. Data types are not comparable. Here's a summary of some of the things that an individual does when it comes to working with arrays.1.

1.shell IntroductionThe shell itself is a program written in C, which is a bridge for users to use Linux. The shell is both a command language and a programming language. As a command language, it interprets and executes user-entered commands

1007: [HNOI2008] Horizontal visible LineTime Limit: 1 Sec Memory Limit: 162 MBSubmit: 4567 Solved: 1686DescriptionThere are n linear l1,l2 on the Xoy Cartesian plane,... Ln, if the Y value is positive infinity down, you can see a sub-segment of Li,