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Get yesterday's date in bash on Linux, DST-safe
...that switching between summer and winter time is always done during night, if I understand correctly?
– Nicolas Raoul
Mar 28 '17 at 3:38
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How to put an image in div with CSS?
...nt/
This has been tested on Chrome, firefox and Safari. (I'm on a mac, so if someone has the result on IE, tell me to add it)
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What is the X-REQUEST-ID http header?
...en you're operating a webservice that is accessed by clients, it might be difficult to correlate requests (that a client can see) with server logs (that the server can see).
The idea of the X-Request-ID is that a client can create some random ID and pass it to the server. The server then include th...
Read and overwrite a file in Python
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If you don't want to close and reopen the file, to avoid race conditions, you could truncate it:
f = open(filename, 'r+')
text = f.read()
text = re.sub('foobar', 'bar', text)
f.seek(0)
f.write(text)
f.truncate()
f.close()
Th...
Better way to revert to a previous SVN revision of a file?
...thing - say, I'm at revision 855, I want to revert a file to revision 854. If I do svn merge -c -854 my.file, and then do svn diff, it seems to show one revision before 854 (that is, 853); only when I do svm merge -c 854 myfile (without the -), it looks like myfile is reverted to rev 854. Thanks aga...
How to delete a certain row from mysql table with same column values?
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This only deletes one row. If there were 3 with this user and product id then 2 would remain.
– Rob
Aug 22 '13 at 10:48
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What is a unix command for deleting the first N characters of a line?
...un essentially that command, 'cut' doesn't print the results to stdout ... if i just run 'tail -f logfile | cut -c 5-' i can see the results ... the problem must be with grep i'm using cygwin FYI thanks
– les2
Jun 9 '09 at 19:15
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Using Application context everywhere?
...ith anything that deals with the GUI that requires a Context. For example, if you pass the application Context into the LayoutInflater you will get an Exception. Generally speaking, your approach is excellent: it's good practice to use an Activity's Context within that Activity, and the Application ...
Convert Pixels to Points
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There are 72 points per inch; if it is sufficient to assume 96 pixels per inch, the formula is rather simple:
points = pixels * 72 / 96
There is a way to get the configured pixels per inch of your display in Windows using GetDeviceCaps. Microsoft has a...
How can I mask a UIImageView?
...geView.layer.mask = mask;
yourImageView.layer.masksToBounds = YES;
For Swift 4 and plus follow code below
let mask = CALayer()
mask.contents = [ UIImage(named: "right_challenge_bg")?.cgImage] as Any
mask.frame = CGRect(x: 0, y: 0, width: leftBGImage.frame.size.width, height: leftBGImage.frame.si...