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Bash conditionals: how to “and” expressions? (if [ ! -z $VAR && -e $VAR ])
...$VAR is empty.
Your version does not work because it evaluates to [ -e ]. Now in this case, bash simply checks if the single argument (-e) is a non-empty string.
From the manpage:
test and [ evaluate conditional expressions using a set of rules based on the number of arguments. ...
1 argu...
The static keyword and its various uses in C++
...ses), then it can't be accessed from any other translation unit. This is known as "internal linkage" or "static storage duration". (Don't do this in headers except for constexpr. Anything else, and you end up with a separate variable in each translation unit, which is crazy confusing)
If it's a var...
Git: Correct way to change Active Branch in a bare repository?
...zarre. Just goes to show how hard it is to find something when you don't know exactly what you're looking for.
– kbro
Jul 22 '10 at 8:51
...
C++ where to initialize static const
... stricly speaking the above example is correct if there is no other code. Now I do appreciate your comment (+1), I'm still learning things myself! So I'll try and clarify that point in the answer, please let me know if it's better...
– squelart
Apr 9 '10 at 12...
Which version of the git file will be finally used: LOCAL, BASE or REMOTE?
...g to merge, and the 3rd tab, open by default, shows the 3-way merge view.
Now, the reason the feature is hidden is that it's not polished enough yet. It's very useful as it is now, but Kai Willadsen, the meld author, pointed to few wrinkles that need ironing out. For example there's no GUI to start...
How to set the thumbnail image on HTML5 video?
...of_video.png" alt="image" />
/* write your code for the video here */
Now using jQuery play the video and hide the image as
$('img').click(function () {
$(this).hide();
// use the parameters to play the video now..
})
...
How do I contribute to other's code in GitHub? [closed]
...
@MariusKavansky it's the other way round! Once you know what to work on, then only you contribute :)
– hashbrown
Jan 7 '14 at 6:46
...
How does password salt help against a rainbow table attack?
...d the salt, so when running the dictionary attack, she can simply use the known salt when attempting to crack the password.
A public salt does two things: makes it more time-consuming to crack a large list of passwords, and makes it infeasible to use a rainbow table.
To understand the first one, i...
“Keep Me Logged In” - the best approach
...cookie for this purpose, you're doing something wrong.
There. I said it. Now we can move on to the actual answer.
What's wrong with hashing user data, you ask? Well, it comes down to exposure surface and security through obscurity.
Imagine for a second that you're an attacker. You see a cryptog...
Checking to see if a DateTime variable has had a value assigned
...est.StartDateTime == default(DateTime) { request.StartDateTime = DateTime.Now; }
– Menol
May 13 '16 at 8:33
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