Jan 7, 2009 · If you are trying to close a question where someone should be using this idiom and isn't, consider closing as a duplicate of Why is Python running my module when I import it, and how do I …

Apr 18, 2012 · There are two switches for the if condition which check for a file: -e and -f. What is the difference between those two?

Every command that runs has an exit status. That check is looking at the exit status of the command that finished most recently before that line runs. If you want your script to exit when that test returns …

if and #if are different things with different purposes. If you use the if statement, the condition is evaluated at runtime, and the code for both branches exists within the compiled program. The …

Jul 24, 2009 · No, it is not. As I'm using EXISTS, I was just following what I thought was standard practice in sub-queries using EXISTS.

Java has 5 different boolean compare operators: &, &&, |, ||, ^ & and && are "and" operators, | and || "or" operators, ^ is "xor" The single ones will check every parameter, regardless of the values, before …

@xbonez: Never underestimate compilers... I wouldn't be surprised if both pieces of code ended up with the same assembly (in C, where == cannot be overloaded) as the compiler could infer that only one …

I know this question is old and I haven't done a search yet, but it made me wonder whether showing branching is even a good idea for sequence diagrams. I always thought the conditions for the …

The zmbq solution is good, but cannot be used in all situations, such as inside a block of code like a FOR DO (...) loop. An alternative is to use an indicator variable. Initialize it to be undefined, and then …

I understand the usual way to write an "if - else if" statement is as follow: