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Get the date (a day before current time) in Bash
... a one-liner, so cut and paste should work -- no line endings assumed. date_days_past () { days_past=${1:-0}; if ! date -v-${days_past}d +%Y%m%d 2>/dev/null; then date --date="-${days_past} day" +%Y%m%d; fi }
– Noah Spurrier
May 16 '16 at 21:29
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LINQ query on a DataTable
...B Version: Dim results = From myRow In myDataTable.AsEnumerable _ Where myRow.Field("RowNo") = 1 _ Select myRow
– Jeff
Jul 29 '09 at 20:46
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Best way to change the background color for an NSView
...:dirtyRect];
}
In Swift:
class MyView: NSView {
override func draw(_ dirtyRect: NSRect) {
super.draw(dirtyRect)
// #1d161d
NSColor(red: 0x1d/255, green: 0x16/255, blue: 0x1d/255, alpha: 1).setFill()
dirtyRect.fill()
}
}
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Take a screenshot of a webpage with JavaScript?
... to build the control in VB6 to take the screenshot. I had to use the keybd_event API call because SendKeys can't do PrintScreen. Here's the code for that:
Declare Sub keybd_event Lib "user32" _
(ByVal bVk As Byte, ByVal bScan As Byte, ByVal dwFlags As Long, ByVal dwExtraInfo As Long)
Public Const...
window.onload vs
...Script libraries, Prototype, ExtJS, Dojo, JQuery, YUI, etc. provide nice wrappers around events that occur as the document is loaded. You can listen for the window onLoad event, and react to that, but onLoad is not fired until all resources have been downloaded, so your event handler won't be execut...
Android ListView headers
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Why can't Google just make this happen with just 3 lines of code?
– Ojonugwa Jude Ochalifu
Jun 22 '15 at 15:40
4
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Fundamental difference between Hashing and Encryption algorithms
...ant an explanation, I'll do my best here:
Hash Functions
They provide a mapping between an arbitrary length input, and a (usually) fixed length (or smaller length) output. It can be anything from a simple crc32, to a full blown cryptographic hash function such as MD5 or SHA1/2/256/512. The point...
Ruby on Rails: How can I revert a migration with rake db:migrate?
...to revert.
eg. if you want to revert a migration with file name 3846656238_create_users.rb
rake db:migrate:down VERSION=3846656238
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Make an image width 100% of parent div, but not bigger than its own width
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If the image is smaller than parent...
.img_100 {
width: 100%;
}
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How to print matched regex pattern using awk?
...Relevant manual page: https://www.gnu.org/software/sed/manual/sed.html#Back_002dreferences-and-Subexpressions
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