while loop syntax in unix

This error occurs because some Linux systems use Ash to compile shell scripts by default, as is my machine, but the scripts I write should be executed with bash. Although I noted in the beginning #!/bin/bash, as if it is still the default to find Ash, it is very frustrating. Search the internet for a bit, find two solutions: 1, modify script 2, modify the system default execution Shell toolThe first kind of practice is that the original for loop is si

Article Title: List is used as a loop in Unix. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. When developing applications in Unix operating systems, loop statements can be said to

To write a program that imports data in batches, learn to write shell scripts! Now learn to use!============================================1, the first simple for loop#!/bin/bashFor I in 1 2 3 4;Doecho $i;Done2. Test for self-growing loops:#!/bin/bashfor ((I=1; iDoecho $i;DoneIf there is an error, no then skip:Syntax Error:bad for loop variableReason: The code is not wrong for standard bash, because Ubuntu

goes back to maintain the heap of code, it is difficult to forget some special characters. There are too many special rules to be remembered when you fully master bash scripts! In addition, various shell implementations are deeply immersed in various inconsistencies due to complexity. No wonder many people think shell syntax is messy. In short, it will not cause any obstacles to communication with other project partners in the future. I decided to s

去6元钱。daySum -= 6; 由此还隐含了一个问题，就是如果不是5的倍数天的话，钱要累加daySum += dayMoney;F:因为不知道是多少天，所以我用死循环，一旦超过100元我就退出循环。*/class WhileDemo {public static void main(String[] args) {//每天要存储的钱是2.5元double dayMoney = 2.5;//存钱的初始化值是0double daySum = 0;//从第一天开始存储int dayCount = 1;//最终存储不小于100就不存储了int result = 100;//因为不知道是多少天，所以我用死循环，while(true) {//累加钱daySum += dayMoney;//一旦超过100元我就退出循环。if(daySum >= result) {System.out.println("共花了"+dayCount+"天存储了100元");break;}if(dayCount%5 == 0) {//花去6元钱daySum -= 6;System.out.println("第"+d

= Two for loop statementsFor {set I 0} {$ I Incr I 1. Note that this parentheses must be written at the end of this line: ARGs: shocould be "for start test next command".........................} Q: Can I change the number I specified. For example, how many numbers do I specify as 3 5 6 7 9? Thank you.Foreach I {1 3 5 7 9 }{Puts "$ I"} Note: Keep CT uses the Tcl syntax instead of the shell

: # Use loop to calculate " 1 + 2 + 3 +... + 100 " Result. # History :# 2005 / 08 / 29 Vbird first releasepath =/Bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin :~ / Binexport paths = 0 # This is the total numeric variable I = 0 # This is a cumulative value, that is 1 ,2 , 3 .... While [ " $ I " ! = " 100 " ] Do I = $ ($ I + 1 ) # Every time I is added 1 S = $ ($ S +$ I) # Add the total number once every time! Done Echo

supports different types of loops:· for-loop code block for a certain number of times· for/in -Looping through the properties of an object· While-loops the specified block of code when the specified condition is true· Do/while -also loops the specified code block for loops when the specified condition is trueA For loop is a tool that you will often use when you want to create loops.Here is the

/lang/system.out:ljav -a/io/PrintStream; -32: Iload_2 -33:invokevirtual #22//Method Java/io/printstream.prin - tln: (I) V in36:iinc 3, 1 -39: Iload_3 to40:iload 4 +42:IF_ICMPLT 24 -45:returnThis is the complete main function corresponding to the 45 bytecode directive, because this involves some compression stack, stack, push and so on some of the computer's original rational content and the knowledge of these bytecode instructions need some knowledge of C + +, so it is not explained. After a sim

Loop syntax in the shellYun ZhengjieCopyright Notice: Original works, declined reprint! Otherwise, the legal liability will be investigated.A. For Loop1. Syntax format 11 for inch Value 1 value 2 value 3 ... 2 Do 3 Source Code 4 Done 　　2. Syntax Format 21 for (initial value; cyclic control condition; variable chang

Notes on the basic syntax structure of PHP loop statements. In php, loop statements include many, such as for, foreach, while, dowhile, and goto statements. below I will give you a brief introduction to the structure and usage of these loop statements. For loop control for (

This happens because the file line break you are working with is "\ r \ n" in DOS format.You can use the Cat-v file name to see if the newline character is, and if it is, the end of the line will be ^m"\ n" needs to be converted into Linux/unix formatThe specific conversion method is to convert the newline character.You can use the SED command to process a file with the following command:Sed ' s/\r//' original files > converted FilesThe parameters of

: Iload_331 40:iload 4 42:IF_ICMPLT 2433: return This is the complete main function corresponding to the 45 bytecode directive, because this involves some compression stack, stack, push and so on some of the computer's original rational content and the knowledge of these bytecode instructions need some knowledge of C + +, so it is not explained. After a simple control of the bytecode instruction table, my personal understanding of these 45 bytecode is that Java converts the Foreach

Query syntax allowsProgramLogical expressions are converted from imperative to declarative ". The query syntax defines the desired result and submits the specific implementation to other special implementations.You can use the query syntax (or the method syntax that implements the query expression mode) to clearly expr

In php, loop statements include many, such as for, foreach, while, do while, and goto statements. Below I will give you a brief introduction to the structure and usage of these loop statements. For Loop Control For (initial cyclic values; cyclic conditions; step size ){// Execute the statement; } Example The Code is as follows: Copy code F

Through the shell example to learn the syntax of the loop structure: the so-called useful is to learn to use it all the time. it is useless if you forget it. On the other hand, it is very likely that the leaders have great expectations for you. So what we learn should be used frequently in practice... information n use shell examples to learn the syntax of the

RELATED Links: PHP Syntax (i): Foundations and variables PHP Syntax (b): Data types, operators, and functions PHP Syntax (iii): Control structure (for loop/if/switch/while) This article I will summarize a few PHP commonly used control structure, first to the most special foreach, the rest of the control structure is s

: This article mainly introduces PHP syntax 3: control structure For loop IfSwitchWhile. if you are interested in PHP tutorials, refer to it. Related links: PHP syntax(1): Basics and variables PHP syntax(2): data types, operators, and functions PHP syntax(3): control struct

Run a test script under Deepin to prompt for a syntax error for the loop: syntax Error:bad for loop variable2014 version Deepin is based on the ubuntu,2015 version of Deepin based Debian, the problem should appear on the dash again, andDash is the Debian version. The workaround is: Cancel Dashsudo dpkg-reconfigure dash

Java syntax (6): general Linux technology-Linux programming and kernel information. For details, see the following section. Loop: for, while, and do Java has three types of loop control statements: for statement, while statement, and do statement. The following describes the structure of these three statements. 1: for Loop