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Is double square brackets [[ ]] preferable over single square brackets [ ] in Bash?
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[[ has fewer surprises and is generally safer to use. But it is not portable - POSIX doesn't specify what it does and only some shells support it (beside bash, I heard ksh supports it too). For example, you can do
[[ -e $b ]]
to test whether a file exists....
Return a `struct` from a function in C
... from a function, to which I replied: "No! You'd return pointers to dynamically malloc ed struct s instead."
9 Answers
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Add new column with foreign key constraint in one command
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As so often with SQL-related question, it depends on the DBMS. Some DBMS allow you to combine ALTER table operations separated by commas. For example...
Informix syntax:
ALTER TABLE one
ADD two_id INTEGER,
ADD CONSTRAINT FOREIGN KEY(two_id) REFERENCES two(id);
The syntax for IBM DB2 LU...
ASP.NET Web API Authentication
...rom a client application while using the ASP.NET Web API . I have watched all the videos on the site and also read this forum post .
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moment.js - UTC gives wrong date
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Many thanks. So basically, I should always pass in time when using UTC or pass in UTC as in your second approach.
– brg
Jul 25 '13 at 12:08
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What do the f and t commands do in Vim?
... information but people keep telling me that they are very useful. Would really appreciate an answer with an example if possible, thanks!
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Get characters after last / in url
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This cuts of the first character if there is no slash at all.
– redanimalwar
Nov 2 '15 at 13:55
@red...
How to avoid mysql 'Deadlock found when trying to get lock; try restarting transaction'
...tation suggest that in case of a deadlock the client should retry automatically. you can add this logic to your client code. (Say, 3 retries on this particular error before giving up).
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impro...
Why is the JVM stack-based and the Dalvik VM register-based?
...s for instructions
are largely implicit, the object
code will tend to be smaller. This
is important if you're going to be
downloading the code over a slow
network link.
Going with a register-based scheme probably means that Dalvik's code generator doesn't have to work as hard to produce performant...
Calculate size of Object in Java [duplicate]
...class. Once an agent acquires the Instrumentation instance, the agent may call methods on the instance at any time. " <-- how do I do that (in Eclipse)?
– Tyler Petrochko
Feb 20 '12 at 21:47
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