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Appending a line to a file only if it does not already exist
...ple :)
grep + echo should suffice:
grep -qxF 'include "/configs/projectname.conf"' foo.bar || echo 'include "/configs/projectname.conf"' >> foo.bar
-q be quiet
-x match the whole line
-F pattern is a plain string
https://linux.die.net/man/1/grep
Edit:
incorporated @cerin and @thijs-wout...
appearanceWhenContainedIn in Swift
... for iOS 9:
If you're targeting iOS 9+ (as of Xcode 7 b1), there is a new method in the UIAppearance protocol which does not use varargs:
static func appearanceWhenContainedInInstancesOfClasses(containerTypes: [AnyObject.Type]) -> Self
Which can be used like so:
UITextField.appearanceWhenCon...
Adjust UILabel height depending on the text
...
sizeWithFont constrainedToSize:lineBreakMode: is the method to use. An example of how to use it is below:
//Calculate the expected size based on the font and linebreak mode of your label
// FLT_MAX here simply means no constraint in height
CGSize maximumLabelSize = CGSizeMake(...
How to discover number of *logical* cores on Mac OS X?
...key". There is no cpu related entry in /etc/sysctl.conf as well. Frozen Flame's answer worked.
– TheGT
Oct 5 '16 at 23:39
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How to determine device screen size category (small, normal, large, xlarge) using code?
...
Some devices can have an UNDEFINED size of the screen, so can be useful also check with Configuration.SCREENLAYOUT_SIZE_UNDEFINED.
– valerybodak
Apr 11 '13 at 10:25
...
Export Data from mysql Workbench 6.0
...n_export_options.py
Find line "delayed-insert":["Write INSERT DELAYED statements rather than ...
Insert # at the begin of this line to comment it out
Save file and restart Workbench.
Tested on Windows 7 x64, MySQL 5.6.27 (MyISAM) & Workbench 6.3.5 x64.
Tested on OSX Yosemite 10.10.4, MySQL 5....
Choosing a Windows automation scripting language. AutoIt vs Autohotkey [closed]
...d to choose a Windows automation scripting language. Which one do you recommend; AutoIt , AutoHotkey , or an other?
7 Ans...
possible EventEmitter memory leak detected
...
This is explained in the node eventEmitter documentation
What version of Node is this? What other code do you have? That isn't normal behavior.
In short, its: process.setMaxListeners(0);
Also see: node.js - request - How to “emitter.setMaxListeners()”?
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Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
Is it possible to specify your own distance function using scikit-learn K-Means Clustering?
8 Answers
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Rails 4 multiple image or file upload using carrierwave
... using Rails 4 and CarrierWave? I have a post_controller and post_attachments model. How can I do this?
6 Answers
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