Simple Report all non-const variables declared at namespace scope. Avoid singletons Singletons are basically complicated global objects in disguise. In a multi-threaded environment, the initialization of the static object does not introduce a race condition unless you carelessly access a shared object from within its constructor. Note that the initialization of a local static does not imply a race condition.
The differences between the First of all explicit declation and then usage of "normal" programming language notation implicitly means that you use But you better be explicit.
Here you always need to use let. There should be no gotchas here. I would prefer always use.
The let statement requires that there be no spaces around not only the assignment operator the equal signbut around any of the other operators as well: As string between and is considered to be included in double quotes, in most more or less complex cases the String between and is considered to be included in double quotes which makes the Of cause, this is perversion, but still It is commonly referred to as the conditional operator, inline if iifor ternary if.
Other ternary operators so rare, that the conditional operator is commonly referred to as the ternary operator.
It is now re-implemented and is available in bash. Daniel Daranas asked Oct 17 '10 at If the condition is merely checking if a variable is set, there's even a shorter form: As alex notes in the comment, this approach is technically called "Parameter Expansion".
O May 12 '11 at Gotchas treats any strings as 0.
Generally in shells like bash or ksh93 spaces are treated as in any normal algorithmic language: But there are some exception. Spaces before and after equal sign have a special meaning in shell.
And that a gotcha that you need to be aware of: Spaces before and after equal sign have a special meaning:– Reading, Writing and Arithmetic The Sundays released their first single " Can't Be Sure " in January It topped the British indie charts and received acclaim as one of .
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Later bash (starting from version ) re-implemented most of the advanced features of ksh93 plus a couple of its own.
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