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Negative matching using grep (match lines that do not contain foo)
...s your friend:
grep --help | grep invert
-v, --invert-match select non-matching lines
Also check out the related -L (the complement of -l).
-L, --files-without-match only print FILE names containing no match
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How to switch databases in psql?
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You can select the database when connecting with psql. This is handy when using it from a script:
sudo -u postgres psql -c "CREATE SCHEMA test AUTHORIZATION test;" test
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Extract every nth element of a vector
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To select every nth element from any starting position in the vector
nth_element <- function(vector, starting_position, n) {
vector[seq(starting_position, length(vector), n)]
}
# E.g.
vec <- 1:12
nth_element(vec, ...
CSS rule to apply only if element has BOTH classes [duplicate]
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So, this will not select <div class="abc"> because it lacks xyz?
– Majid Fouladpour
Apr 26 '11 at 21:30
5
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Emacs Ruby autocomplete almost working
...e. This works well in most files except I've found it doesn't allow me to select an answer from the table when I'm editing some code in my ruby on rails project.
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How do I install jmeter on a Mac?
...nal.
x.x.x is the version you use.
Finally, when started you may want to select System Look and feel for Mac OSX better integration.
Menu > Options > Look and Feel > System
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Copy paste text into iOS simulator
...board which apps running on that device (simulator) use via the iOS pup-up select-all/copy/paste UI items.
Completely separate from that: your mac has it's own clipboard and content. The Simulator program running on your mac provides the Edit > Paste Text menu item. The program implements that m...
How do I remove all .pyc files from a project?
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If you're using bash >=4.0 (or zsh)
rm **/*.pyc
Note that */*.pyc selects all .pyc files in the immediate first-level subdirectories while **/*.pyc recursively scans the whole directory tree. As an example, foo/bar/qux.pyc will be deleted by rm **/*.pyc but not by */*.pyc.
The globstar she...
How do you log all events fired by an element in jQuery?
...ouse'); // logs mouse events on the body
monitorEvents(document.body.querySelectorAll('input')); // logs all events on inputs
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Get element inside element by class and ID - JavaScript
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Well, first you need to select the elements with a function like getElementById.
var targetDiv = document.getElementById("foo").getElementsByClassName("bar")[0];
getElementById only returns one node, but getElementsByClassName returns a node list...