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How can I remove all text after a character in bash?
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In Bash (and ksh, zsh, dash, etc.), you can use parameter expansion with % which will remove characters from the end of the string or # which will remove characters from the beginning of the string. If you use a single one of those characters, the smalle...
sql primary key and index
...v is constrained overhead for index fragmentation, imperfect tree balance, etc.. Thus 2 billion rows would be log base 2 of 2,000,000,000 (about 31 seeks) times, say, 2 or 3 or even 10. 40M inserts per day is about 462/sec, ~100 IO's per insert... Ahh... Oh. I see. And this was before widespread SSD...
How to handle configuration in Go [closed]
...s setting activated?", "what does it do?", "what are valid values for it?" etc).
– Darian Moody
Jan 22 '15 at 2:04
7
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Mapping a function on the values of a map in Clojure
...ure.walk/walk #(apply f %) identity m) )
Parellel versions – pmap-map, etc.
There are also parallel versions of these functions if you need them. They simply use pmap instead of map.
(defn pmap-map [f m]
(into (empty m) (pmap #(apply f %) m)) )
(defn pmap-map-keys [f m]
(pmap-map (fn [...
How to save a PNG image server-side, from a base64 data string
...om the explode, depending on whether it's data:image/jpg or data:image/png etc.
– drew010
Feb 16 '17 at 16:17
i got th...
I can’t find the Android keytool
...ith the Java SDK. You should find it in the directory that contains javac, etc.
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How do I center align horizontal menu?
... solutions, including the mix of inline-block / block / center-align etc., but haven't succeeded.
16 Answers
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Different bash prompt for different vi editing mode?
...the current editing mode.
So putting
set show-mode-in-prompt on
into /etc/inputrc or ~/.inputrc (thx stooj) should affect all your readline-enabled programs ;)
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How do I get the coordinates of a mouse click on a canvas element?
...s a simplification of @Aldekein´s solution but without jQuery.
function getCursorPosition(canvas, event) {
const rect = canvas.getBoundingClientRect()
const x = event.clientX - rect.left
const y = event.clientY - rect.top
console.log("x: " + x + " y: " + y)
}
const canvas = docume...
MySQL's now() +1 day
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If more than 1, "day" does not become plural: "7 DAY", etc., is valid. (For those curious.)
– HoldOffHunger
Jun 21 '18 at 14:15
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