I am not sure about DO-WHILE IN MS SQL Server 2008 but you can change your WHILE loop logic, so as to USE like DO-WHILE loop. Examples are taken from here: http://blog.sqlauthority.com/2007/10/24/sql-server-simple-example-of-while-loop-with-continue-and-break-keywords/ Example of WHILE Loop DECLARE @intFlag INT SET @intFlag = 1 WHILE (@intFlag <=5) BEGIN PRINT @intFlag SET @intFlag = @intFlag + 1 … Read more
The problem is that do_work.sh runs ssh commands and by default ssh reads from stdin which is your input file. As a result, you only see the first line processed, because the command consumes the rest of the file and your while loop terminates. This happens not just for ssh, but for any command that … Read more
An if statement runs its else clause if its condition evaluates to false. Identically, a while loop runs the else clause if its condition evaluates to false. This rule matches the behavior you described: In normal execution, the while loop repeatedly runs until the condition evaluates to false, and therefore naturally exiting the loop runs … Read more
It’s not that different in bash. workdone=0 while : ; do … if [ “$workdone” -ne 0 ]; then break fi done : is the no-op command; its exit status is always 0, so the loop runs until workdone is given a non-zero value. There are many ways you could set and test the value … Read more
I wouldn’t say it’s bad – but equally I would normally at least look for an alternative. In situations where it’s the first thing I write, I almost always at least try to refactor it into something clearer. Sometimes it can’t be helped (or the alternative is to have a bool variable which does nothing … Read more
It’s not that i– is faster than i++. Actually, they’re both equally fast. What takes time in ascending loops is evaluating, for each i, the size of your array. In this loop: for(var i = array.length; i–;) You evaluate .length only once, when you declare i, whereas for this loop for(var i = 1; i … Read more
Question 1: Why does the following code compile without having a return statement? public int a() { while(true); } This is covered by JLS§8.4.7: If a method is declared to have a return type (§8.4.5), then a compile-time error occurs if the body of the method can complete normally (§14.1). In other words, a method … Read more
echo -e $lines | while read line … done The while loop is executed in a subshell. So any changes you do to the variable will not be available once the subshell exits. Instead you can use a here string to re-write the while loop to be in the main shell process; only echo -e … Read more
The scope of local variables should always be the smallest possible. In your example I presume str is not used outside of the while loop, otherwise you would not be asking the question, because declaring it inside the while loop would not be an option, since it would not compile. So, since str is not … Read more
The best answer here is to use all(), which is the builtin for this situation. We combine this with a generator expression to produce the result you want cleanly and efficiently. For example: >>> items = [[1, 2, 0], [1, 2, 0], [1, 2, 0]] >>> all(flag == 0 for (_, _, flag) in items) … Read more