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Bash command to sum a column of numbers [duplicate]
... lines count?
awk '{ sum += $1; }
END { print sum; }' "$@"
You can then use it without the superfluous 'cat':
sum < FileWithColumnOfNumbers.txt
sum FileWithColumnOfNumbers.txt
FWIW: on MacOS X, you can do it with a one-liner:
awk '{ sum += $1; } END { print sum; }' "$@"
...
Create Directory When Writing To File In Node.js
...fs-extra you can do it easily.
Install it
npm install --save fs-extra
Then use the outputFile method. Its documentation says:
Almost the same as writeFile (i.e. it overwrites), except that if the
parent directory does not exist, it's created.
You can use it in three ways:
Callback styl...
Removing the title text of an iOS UIBarButtonItem
... forBarMetrics:UIBarMetricsDefault];
Then you can remove the back button item title.
If you use Storyboard, you can set navigation attributes inspector Back Button with space.
share
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rsync error: failed to set times on “/foo/bar”: Operation not permitted
... I was using rsync -avc, and adding -O was not helping. I then read that -a was the equiv to -rlptgoD which includes -t which I guess is overriding -O. So for me the fix was to use -rlpgoDvc
– dlink
Sep 21 '16 at 20:17
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Add Variables to Tuple
... to add to the DB, I am thinking of creating tuples out of information and then add them to the DB.
8 Answers
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What's the best way to convert a number to a string in JavaScript? [closed]
... null, or undefined. If n is null or undefined due to a bug in my program, then I'd prefer my program to fail in this state, to give me a better chance of finding and fixing the bug. Program crashes are gifts to the programmer, to help her find the bugs :-). The alternative is to deliver software th...
How can I get the current page's full URL on a Windows/IIS server?
...header, or worse, someone could point a DNS record to your IP address, and then your server / website would be serving out a website with dynamic links built on an incorrect URL. If you use the latter method you should also configure your vhost or set up an .htaccess rule to enforce the domain you w...
Calculate size of Object in Java [duplicate]
...untime.getRuntime().freeMemory() before and after creating the object and then recording the difference, but it would only give 0 or 131304, and nothing in between, regardless of the number of elements in the structure. Help please!
...
Check if UIColor is dark or bright?
...and not using the built in colors such as UIColor.black and UIColor.white, then possibly you can remove the additional checks.
extension UIColor {
// Check if the color is light or dark, as defined by the injected lightness threshold.
// Some people report that 0.7 is best. I suggest to fi...
Getting reference to the top-most view/window in iOS application
... one UIWindow in your application. For example, if a keyboard is on screen then [[UIApplication sharedApplication] windows] will contain at least two windows (your key-window and the keyboard window).
So if you want your view to appear ontop of both of them then you gotta do something like:
[[[[UI...