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How does bash tab completion work?
...ary, as already mentioned by fixje, manages the command line editing, and calls back to bash when tab is pressed, to enable completion. Bash then gives (see next point) a list of possible completions, and readline inserts as much characters as are identified unambiguously by the characters already t...
What is the purpose of a plus symbol before a variable?
this really sounds like a simple question but I had no luck searching. what does the +d in
3 Answers
...
PadLeft function in T-SQL
...tableA)), SPACE(1), '0') AS [padded_id] FROM tableA
this should theoretically move the goal posts... as the number gets bigger it should ALWAYS work.... regardless if its 1 or 123456789...
So if your max value is 123456... you would see 0000123456 and if your min value is 1 you would see 00000000...
How do I select an entire row which has the largest ID in the table?
... said, I'm just guessing based on the name that it isn't. MySQL is historically known to have bad performance with subselects. That has vastly improved in newer versions though, so depends what version you're using. However, rethinking it, this particular query may be OK. Although running a query a ...
Functions that return a function
...e to the function. Putting the parenthesis at the end of a function name, calls the function, returning the functions return value.
Demo
function a() {
alert('A');
}
//alerts 'A', returns undefined
function b() {
alert('B');
return a;
}
//alerts 'B', returns function a
function c() {...
How to check type of variable in Java?
...
Java is a statically typed language, so the compiler does most of this checking for you. Once you declare a variable to be a certain type, the compiler will ensure that it is only ever assigned values of that type (or values that are sub-ty...
jQuery: Selecting by class and input type
...ass")
And it will also work properly. In my humble opinion this syntax really looks rather ugly, as most of the time I expect : style selectors to come last. As I said, though, either one will work.
share
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How to test an Internet connection with bash?
...on't get, just check page availability
$? : shell return code
0 : shell "All OK" code
Without wget
#!/bin/bash
echo -e "GET http://google.com HTTP/1.0\n\n" | nc google.com 80 > /dev/null 2>&1
if [ $? -eq 0 ]; then
echo "Online"
else
echo "Offline"
fi
...
Editing screenshots in iTunes Connect after iOS app was approved
...
I really don't understand this. The screenshots are quite important and sometimes you upload something that might have an error / issue. Why can we not just update our app's metadata without having to upload an entire new binar...
Why are there two ways to unstage a file in Git?
...
git rm --cached <filePath> does not unstage a file, it actually stages the removal of the file(s) from the repo (assuming it was already committed before) but leaves the file in your working tree (leaving you with an untracked file).
git reset -- <filePath> will unstage any st...